FR2925846A1 - Composition, useful for simultaneous bleaching and coloring of keratin fibers, preferably hair, comprises cationic direct dyes having tetraazapentamethine structure, peroxygen salts, and/or alkaline agents and/or their precursors - Google Patents

Abstract

Composition (A) for simultaneous bleaching and coloring of keratin fibers, preferably hair, comprises: one or more cationic direct dyes having tetraazapentamethine structure (I); one or more peroxygen salts; and one or more alkaline agents and/or their precursors. Composition (A) for simultaneous bleaching and coloring of keratin fibers, preferably hair, comprises: one or more cationic direct dyes having tetraazapentamethine structure of formula (W 1-N=N-C(R 0)=N-N=W 2) (I); one or more peroxygen salts; and one or more alkaline agents and/or their precursors. W 1heteroaromatic cationic group of formula (II) or (III); W 2heteroaromatic group of formula (IV) or (V); Z 0N, CR 2or NR 2 1; Z 1O, S, NR 9or CR 1 3; Z 2CR 1 0; Z 3CR 1 1; Z 4CR 1 2; Z 5N, CR 3, or C; Z 6N or CR 1 4; Z 7O, S, NR 1 5or CR 1 9; Z 8N or CR 1 6; Z 9N or CR 1 7; Z 1 0N or CR 1 8; Z 1 1N, CR 8or C; Z 1 2N or CR 2 0; Z 1 3CR 6, N or NR 2 2; T : OH, 1-2C alkoxy, 2-4C (poly)-hydroxyalkoxy, NH 2, (di)(1-2C alkyl)amino, carboxy or sulfonic group; R 1, R 4, R 5, R 7, R 9, R 1 5, R 2 1, R 2 21-8C alkyl (optionally substituted by 1-3 groups of T); either R 2, R 6, R 1 0, R 1 3, R 1 6, R 1 9H, 1-4C alkyl (optionally substituted by 1-3 groups of T), phenyl (optionally substituted by 1-3 groups of OH, 1-2C alkoxy, 2-4C (poly)-hydroxyalkoxy, NH 2or (di)(1-2C alkyl)amino), carboxy, or sulfoamino (HO 3S-NH-); and R 0, R 3, R 8, R 1 1, R 1 2, R 1 4, R 1 7, R 1 8, R 2 0H, 1-16C hydrocarbon chain (optionally saturated and substituted by 1-3 groups of T, sulfoamino, 2-4C (poly)hydroxyalkylamino, or halo (preferably Cl, F or Br)), hydrocarbon chain (optionally interrupted by one or two O, N, S or SO 2), 1-4C alkoxy (optionally substituted by 1 or 2 OH groups), phenyl (optionally substituted by OH, 1-2C alkoxy, 2-4C (poly)hydroxyalkoxy, (di)(1-2C alkyl)amino, carboxy, sulfonic groups or Halo (preferably Cl, F or Br)), 5-6 membered aromatic heterocyclic groups (preferably pyrazolyl, pyrrolyl, imidazolyl, thiazolyl, oxazolyl, triazolyl, pyridinyl, pyrimidinyl, triazinyl, pyrazinyl or pyridazinyl or their cationic equivalents of N, or N having 1-6C alkyl), sulfoamino (HO 3S-NH-), carboxy, amino, (di)(1-4C alkyl)amino or 2-4C (poly)-hydroxyalkylamino; or R 2R 1 0, R 1 1R 1 2, R 6R 1 6, R 1 7R 1 85-6 membered aromatic cycle optionally substituted by one or two groups of OH, NH 2, (di)(1-2C alkyl)amino, 1-2C alkoxy, or 2-4C amino(poly)hydroxyalkyl; and X ->organic or inorganic anion. Where: the groups (II)-(V) does not have more than three nitrogen atoms, and two of the three nitrogen atoms can be adjacent; the bond a of 5 membered cationic heteroaromatic group (II) is linked to N, which is linked to W 1of (I); the bond b of 6 membered cationic heteroaromatic group (III) is linked to N, which is linked to W 1of (I); the double bond c of 5 membered heteroaromatic group (IV) is linked to the N, which is linked to W 2of (I); the double bond d of 6 membered heteroaromatic group (V) is linked to the N, which is linked to W 2of (I); the bond b, linking the heteroaromatic group (III) to N, which is linked to W 1of (I), is situated in ortho position of the N carrying the group R 4, when Z 5is -CR 3-, or in para position of the N carrying the group R 4, when Z 5is C, or in ortho position of the N carrying the group R 4, when Z 5is N; or the bond c, linking the heteroaromatic group (V) to N, which is linked to W 2of (I), is situated in ortho position of the N carrying the group R 7, when Z 1 1is -CR 8-, or in para position of the N carrying the group R 7, when Z 1 1is C, or in ortho position of the N carrying the group R 7, when Z 1 1is N; and R 0, R 3, R 8, R 1 1, R 1 2, R 1 4, R 1 7, R 1 8and R 2 0are not having peroxide bond, diazo or nitroso group. Independent claims are included for: (1) a method for the simultaneous bleaching and coloring of keratin fibers, comprising mixing (A) with a solution of hydrogen peroxide in the form of paste or powder; and applying the mixture to the keratin fibers; and (2) a device with several-compartments, comprising at least two compositions, of which the compositions are mixed. [Image].

Description

B 07/1775 EN IC OA07563 / CW Société Anonyme known as L'OREAL Composition for bleaching / staining of keratin fibers with a tetraazapentamethine cationic direct dye Invention of: Maxime de BONI Bleaching / coloring composition of keratin fibers with a tetraazapentamethine cationic direct dye The invention relates to a composition for the bleaching and the simultaneous dyeing of keratinous fibers, in particular human keratinous fibers such as the hair, comprising the combination of one or more tetraazapentamethine cationic direct dyes, one or more peroxygenated salts and of one or more alkaline agents, a process of discoloration / coloration using it and multi-compartment devices containing it. When a person wishes to radically change hair color, especially when it wishes to obtain a lighter color than its original color, it is often necessary to carry out a discoloration, and possibly a hair coloring. To do this, there are several methods. The first method is to use lightening products based on ammonia and hydrogen peroxide. These products may optionally contain dyes which allows to lighten and color the hair simultaneously. However, the lightening performance of these products remains limited, more particularly for applications on natural and / or colored dark-colored hair. The second method consists in applying to the hair a lightening composition based on peroxygenated salts such as persulfate, and alkaline agents, in which hydrogen peroxide has been added at the time of use, in order to obtain a more important clarification. This type of product is very satisfying and more suitable for dark hair, but it only leads to a very limited range of reflections. It is then necessary to correct the shade obtained by applying in the second time a coloring product on the hair. This two-step process has the disadvantage of being relatively long. To overcome this disadvantage, it is known to add to these lightening products dyes. This method makes it possible to simultaneously color and discolor the hair fiber. The level of lightening being important, it is particularly well suited to dark hair natural and / or colored. However, there is a very small number of stable dyes under these highly oxidizing conditions, which limits the variety of reflections that can be obtained. Moreover, this instability results in a more or less rapid modification of the reflection during the application, which leads to results that are not very reproducible. In addition, the toughness of these dyes in the face of external agents, in particular light and shampoos, is not satisfactory.

After extensive research conducted on the question, the applicant has now discovered that it is possible to obtain new compositions for the bleaching and the simultaneous dyeing of keratinous fibers, and in particular human keratinous fibers such as the hair, particularly well suited to dark hair, overcoming the problems outlined above. These novel compositions combine one or more particular tetraazapentamethine cationic direct dyes as described below with one or more peroxygenated salts and one or more alkaline agents and / or one or more alkali precursors. In particular, they make it possible to obtain powerful and not very selective colorations which, moreover, are resistant to the various aggressions that the hair can undergo. The subject of the present invention is therefore a composition for the bleaching and the simultaneous dyeing of keratinous fibers, in particular of human keratinous fibers, and more particularly of hair, comprising: (i) one or more tetraazapentamethine cationic direct dyes of formula (I) as defined below, (ii) one or more peroxygenated salts, and (iii) one or more alkaline agents and / or one or more alkali precursors. Another object of the present invention is a process using the composition according to the invention.

The invention further relates to multi-compartment devices or kits comprising said composition. The tetraazapentamethine cationic direct dye (s) used in the composition of the invention correspond to formula (I): in which: W 1 represents a cationic heteroaromatic group of formula (II) or (III): R 3 -W 2 represents a group heteroaromatic compound of formula (IV) or (V): R8 (V)

in which: - Zo represents a nitrogen atom, -CR2- or -NR21-, - Z1 represents an oxygen or sulfur atom, -NR9-, or -CR13-, - Z2 represents a nitrogen atom or -CR10-, - Z3 represents a nitrogen atom or -CR11-, -Z4 represents a nitrogen atom or -CR12-, -Z5 represents a nitrogen atom, -CR3- or a carbon atom, - Z6 represents a nitrogen atom or -CR14-, -Z7 represents an oxygen or sulfur atom, -NR15-, or -CR19-, -Z8 represents a nitrogen atom or -CR16-, -Z9 represents an atom nitrogen or -CR17-, - Zlo represents a nitrogen atom or -CR18-, - Z11 represents a nitrogen atom, -CR8- or a carbon atom, - Z12 represents a nitrogen atom or -CR20 -, - Z13 represents a group -CR6-, a nitrogen atom or -NR22-, it being understood that each of the cycles of the formulas (II), (III), (IV) and (V) do not comprise more than three nitrogen atoms, and that two of the three nitrogen atoms may be contiguous, - the bond of the heteroaromatic cationic group with 5-membered formula (II) being attached to the nitrogen atom N1 of formula (I), - the bond b of the cationic heteroaromatic 6-membered group of formula (III) being connected to the atom N1 nitrogen of the formula (I), - the double bond to the 5-membered heteroaromatic group of the formula (IV) being connected to the nitrogen atom N2 of the formula (I), - the double bond b 'of the 6-membered heteroaromatic group of the formula (V) being connected to the N2 nitrogen atom of the formula (I), - the bond b, connecting the cationic heteroaromatic group of the formula (III) to the nitrogen atom N 1 of the formula (I) being located: in the ortho position of the nitrogen atom carrying the R 4 group when Z 5 represents -CR 3 -, or in the para position of the nitrogen atom carrying the group R4 when Z5 represents a carbon atom, or • in the ortho position of the nitrogen atom bearing the group R4 when Z5 represents a nitrogen atom, - the bond b ', connecting the heteroaromatic group of the formula (V) at the N2 nitrogen atom of the formula (I), being located: in the ortho position of the nitrogen atom bearing the R7 group when Z11 represents -CR8-, or in the para position of the nitrogen atom carrying the R7 group when Z11 represents a carbon atom, or • in the ortho position of the nitrogen atom carrying the R7 group when Z11 represents a nitrogen atom, - R2, R6, Rio, R13, R16 and R19 are each independently of one another a hydrogen atom; a linear or branched C1-C4 alkyl group unsubstituted or substituted with one to three groups selected from hydroxy, C1-C2 alkoxy, (C2-C4) poly (hydroxy) alkoxy, amino, (di) (alkyl) C1-C2) amino, carboxy or sulfonic; a phenyl group unsubstituted or substituted with one to three groups selected from hydroxy, C1-C2 alkoxy, (C2-C4) poly (poly) hydroxyalkoxy, amino and (di) (C1-C2alkyl) amino; a carboxy group; or a sulfoamino group (HO3S-NH-); R1, R4, R5, R7, R9, R15, R21 and R22 each represent, independently of one another, a linear or branched C1-C8 alkyl group, unsubstituted or substituted with one to three groups selected from hydroxy, C 1 -C 2 alkoxy, C 2 -C 4 (poly) hydroxyalkoxy, amino, (di) (C 1 -C 2) alkylamino, carboxy and sulfonic; - Ro, R3, R8, R11, R12, R14, R17, R18 and R20 are each, independently of one another, a hydrogen atom; a linear, branched or cyclic C1-C16 hydrocarbon-based chain, this chain possibly being saturated or unsaturated by one to three unsaturations, this chain being unsubstituted or substituted by one to three groups chosen from hydroxyl and C 1 -C 2 alkoxy groups, (C2-C4) -alkyl-hydroxyalkoxy, amino, (di) C1-C2alkylamino, carboxy, sulfonic, sulfoamino (HO3S-NH-) and (poly) -hydroxyalkylamino C2-C4, and halogen such as chlorine, fluorine and bromine; the hydrocarbon chain may be further interrupted by one or two oxygen atoms, nitrogen, sulfur or a group SO2; a linear or branched C1-C4 alkoxy group unsubstituted or substituted by one to two hydroxy groups; a phenyl group unsubstituted or substituted with one to three groups selected from hydroxy, C 1 -C 2 alkoxy, C 2 -C 4 (poly) hydroxyalkoxy, amino, (di) (C 1 -C 2) alkylamino, carboxy and sulfonic, and halogen atoms such as chlorine, fluorine and bromine; a 5- or 6-membered aromatic heterocyclic group selected from pyrazolyl, pyrrolyl, imidazolyl, thiazolyl, oxazolyl, triazolyl, pyridinyl, pyrimidinyl, triazinyl, pyrazinyl and pyridazinyl and their cationic equivalents for which the nitrogen atom or one atoms carry a C1-C6 alkyl group; a sulfoamino group (HO3S-NH-); a carboxy group; an amino group; a (di) (C1-C4 alkyl) amino group; a C2-C4 (poly) hydroxyalkylamino group; it being understood that Ro, R3, R8, R11, R12, R14, R17, R18 and R20 have no peroxide bond, nor diazo or nitroso groups, R2 with Rlo, R11 with R12, R6 with R16, and R17 with R18 being able to form independently of each other, a 5- or 6-membered carbon aromatic ring unsubstituted or substituted by one or two hydroxy, amino, (di) (C1-C2alkyl) amino, C1-C2alkoxy, ( poly) C 2 -C 4 hydroxyalkyl amino, and - X- is an organic or inorganic anion. By "unsaturated chain with one to three unsaturations" is meant a chain comprising one to three double bonds and / or triple bonds. As examples of linear, branched or cyclic, saturated or unsaturated C 1 -C 16 hydrocarbon-based chain, mention may be made, for example, of linear or branched alkyl, alkenyl and alkynyl groups and cycloalkyl and cycloalkenyl groups. For the purposes of the present application, the term "cyclic hydrocarbon chain" also means a cyclic hydrocarbon chain which may comprise one to five carbon rings comprising from 3 to 7 ring members.

As an example of a hydrocarbon chain interrupted by an oxygen atom, the following chains: • -CH 2 -O-CH 2 -CH 3, • -CH 2 -CH 2 -O-CH 2 -CH 3 • -CH 2 -CH 2 -CH 2 -O-CH 3, and CH 2 CH 2 An example of a hydrocarbon chain interrupted by a nitrogen atom and an SO 2 group may be -CH 2 -CH 2 -SO 2 -N (CH 3) 2. C2-C4 (poly) hydroxyalkoxy means a C2-C4 alkoxy group substituted with 1 to 2 hydroxyl groups, "C2-C4" (poly) hydroxyalkylamino, for the purposes of the present invention, means a group alkylamino substituted with 1 to 2 hydroxy groups For the purposes of the present application, an organic or inorganic anion is for example chosen from a halide such as chloride, bromide, fluoride or iodide, a hydroxide, a sulphate, a hydrogen sulphate and a CH 2 alkyl (C1-C6) sulphate such as, for example, a methyl sulphate or an ethyl sulphate; an acetate; a tartrate; an oxalate; a (C1-C6) alkyl sulphonate such as methyl sulphonate; an aryl sulphonate which is unsubstituted or substituted by a C1 alkyl group; -C4, such as, for example, 4-tolylsulfonate, Z1 preferably represents an oxygen atom, -NR9- or -CR13-, and Z7 represents an oxygen atom, -NR15- or -CR19- in the formula ( Preferably, Ro represents a hydrogen atom or a linear C 1 -C 6 alkyl group. or branched, unsubstituted or substituted with one to three groups selected from hydroxy, (C 1 -C 2) alkoxy, (C 2 -C 4) poly (hydroxy) alkoxy, amino, (di) (C 1 -C 2) alkylamino, ( poly) C2-C4 hydroxyalkylamino, carboxy and sulfonic acid; a phenyl group unsubstituted or substituted with one to three groups selected from hydroxy, C 1 -C 2 alkoxy, C 2 -C 4 (poly) hydroxyalkoxy, amino, (di) (C 1 -C 2) alkylamino, carboxy and sulfonic, and halogen atoms such as chlorine, fluorine and bromine; a 5- or 6-membered aromatic heterocyclic group selected from pyrazolyl, pyrrolyl, imidazolyl, thiazolyl, oxazolyl, triazolyl, pyridinyl, pyrimidinyl, triazinyl, pyrazinyl and pyridazinyl and their cationic equivalents for which the nitrogen atom or one atoms carry a C1-C6 alkyl group. More preferably, Ro preferably represents a hydrogen atom; a linear or branched C1-C4 alkyl group unsubstituted or substituted with one to two groups selected from hydroxyl, C1-C2 alkoxy, amino, (di) (C1-C2 alkyl) amino, carboxy and sulfonic; a phenyl group unsubstituted or substituted with one to two groups selected from hydroxy, C1-C2 alkoxy, amino, (di) (C1-C2alkyl) amino and (poly) -hydroxyalkylamino C2-C4; a 5- or 6-membered aromatic heterocyclic group chosen from pyrazolyl, pyrrolyl, imidazolyl and pyridinyl groups and their cationic equivalents for which the nitrogen atom or one of the atoms bears a C1-C6 alkyl group.

According to a particularly preferred embodiment, Ro represents a hydrogen atom; methyl, ethyl, propyl, isopropyl, butyl, 2-hydroxyethyl, 2-aminoethyl, 2-methoxyethyl, 1-carboxymethyl, 2-carboxyethyl or 2-sulfoethyl; a phenyl group unsubstituted or substituted with one to two groups selected from hydroxy, C1-C2 alkoxy, amino, (di) (C1-C2alkyl) amino and (poly) -hydroxyalkylamino C2-C4; a 5- or 6-membered aromatic heterocyclic group selected from pyrazolyl, pyrrolyl, imidazolyl and pyridinyl groups and their cationic equivalents for which the nitrogen atom or one of the atoms bears a C1-C6 alkyl group Ro represents even more preferentially a hydrogen atom; a methyl, ethyl, isopropyl or 2-methoxyethyl group; a phenyl group which is unsubstituted or substituted by hydroxy, methoxy, amino, (di) methylamino or (di) (2-hydroxyethyl) amino; a 5- or 6-membered aromatic heterocyclic group selected from imidazolyl and pyridinyl groups and their cationic equivalents for which the nitrogen atom or one of the atoms bears a C1-C6 alkyl group.

R2, R6, Rio, R13, R16 and R19 each preferably represent, independently of one another, a hydrogen atom; a C1-C4 alkyl group unsubstituted or substituted with one to two groups selected from hydroxy, amino and (di) (C1-C2alkyl) amino; a phenyl group; or a carboxy group; or alternatively R 2 with R 6 and R 6 with R 16 together form, independently of one another, an aryl group. According to a particularly preferred embodiment, R2, R6, Rio R13, R16 and R19 each preferably represent, independently of one another, a hydrogen atom; a methyl, 2-hydroxyethyl, phenyl or carboxy group; or R2 with R10 and R6 with R16 together, independently of one another, form a phenyl group.

R1, R4, R5, R7, R9, R15, R21 and R22 each preferably represent, independently of one another, a C 1 -C 4 alkyl group unsubstituted or substituted with one to two groups selected from hydroxyl groups, C1-C2alkoxy, amino, (di) (C1-C2alkyl) amino, carboxy and sulfonic acid. According to a particularly preferred embodiment, R 1, R 4, R 5, R 7, R 9, R 15, R 21 and R 22 each preferably represent, independently of one another, a methyl, ethyl, 2-hydroxyethyl or 1-carboxymethyl group, 2-carboxyethyl or 2-sulfoethyl.

R3, R8, R11, R12, R14, R17, R18 and R20 each represent, preferably and independently of each other, a hydrogen atom; a linear or branched C 1 -C 4 alkyl group, unsubstituted or substituted with one to two groups selected from hydroxy, C 1 -C 2 alkoxy, (C 2 -C 4) (poly) hydroxyalkoxy, amino, (di) (lower alkyl) groups; C1-C2) amino, carboxy and sulfonic; a linear or branched C1-C4 alkoxy group unsubstituted or substituted by one to two hydroxy groups; a C4-05 cycloalkyl group interrupted by a nitrogen atom; a phenyl group unsubstituted or substituted with one to two groups selected from hydroxyl, C 1 -C 2 alkoxy, C 2 -C 4 (poly) hydroxyalkoxy, amino, (di) (C 1 -C 2) alkylamino, carboxy and sulfonic, and halogen atoms such as chlorine, fluorine and bromine; a sulfoamino group (HO3S-NH-); a carboxy group; an amino group; a (di) (C 1 -C 4 alkyl) amino group; or a (poly) -hydroxyalkylamino C2-C4 group.

More preferably, R3, R8, R11, R12, R14, R17, R18 and R20 each represent, independently of one another, a hydrogen atom; C1-C4alkyl, unsubstituted or substituted with one to two groups selected from hydroxy, C1-C2alkoxy, amino, (di) (C1-C2alkyl) amino, (poly) -hydroxyalkylamino C2 -C4 and carboxy; a linear or branched C1-C4 alkoxy group unsubstituted or substituted by one to two hydroxy groups; a C4-05 cycloalkyl group interrupted by a nitrogen atom; a carboxy group; an amino group; a (di) (C1-C2alkyl) amino group; or a (poly) -hydroxyalkylamino C2-C4 group.

According to a particularly preferred embodiment R3, R8, R11, R12, R14, R17, R18 and R20 each represent, independently of one another, a hydrogen atom, a methyl group, 2-hydroxyethyl, pyrrolidine, carboxy, methoxy, ethoxy, 2-hydroxyethyloxy, amino, methylamino, dimethylamino or 2-hydroxyethylamino. In a first preferred variant A, the compounds of formula (I) are chosen from the family defined by the compounds for which W 1 is a 2-pyridinium group and W 2 is a 2-pyridine group. Even more preferably, they are the following compounds - 2- [5- (N-methyl-2-pyridinylidene) -1-formazano] -N-methylpyridinium chloride - 2- [5- (N-methyl) 2-pyridinylidene) -3-methyl-1-formazano] -N-methylpyridinium - 2- [5- (N-methyl-2-pyridinylidene) -3-ethyl-1-formaz ano] -N-methylpyridinium chloride - Chloride 2- [5- (N-methyl-2-pyridinylidene) -3-isopropyl-1-formaz ano] -N-methylpyridinium - 2- [5- (N-methyl-2-pyridinylidene) -3-phenyl] chloride -1- formaz ano] -N-methylpyridinium - 2- [5- (N-methyl-2-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -N-methylpyridinium chloride - chloride of 2- [5- (N-methyl-2-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -N-methylpyridinium - 2- [5- (N-methyl-2-pyridinylidene) -3- chloride (4'-N, N-dimethylaminophenyl) -1-formazano] -N-methylpyridinium - 2- [5- (4-pyrrolidino-N-methyl-2-pyridinylidene) -1-formazano] -4-pyrrolidino chloride N-methylpyridinium - 2- [5- (4-pyrrolidino-N) chloride 2-methyl-pyridinylidene) -3-methyl-1-formazano] -4-pyrrolidino-N-methylpyridinium - 2- [5- (4-pyrrolidino-N-methyl-2-pyridinylidene) -3-ethyl-1-chloride -formazano] -4-pyrrolidino-N-methylpyridinium - 2- [5- (4-pyrrolidino-N-methyl-2-pyridinylidene) -3-isopropyl-1-formazano] -4-pyrrolidino-N-methylpyridinium chloride - 2- [5- (4-Pyrrolidino-N-methyl-2-pyridinylidene) -3-phenyl-1-formazano] -4-pyrrolidino-N-methylpyridinium chloride - 2- [5- (4-pyrrolidino) chloride N-methyl-2-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -4-pyrrolidino-N-methylpyridinium -N- [5- (4-pyrrolidino-N-methyl-2-pyridinylidene) chloride ) -3- (4'-Hydroxyphenyl) -1-formazano] -4-pyrrolidino-N-methylpyridinium - 2- [5- (4-pyrrolidino-N-methyl-2-pyridinylidene) -3- (4 ') chloride N, N-dimethylaminophenyl) -1-formazano] -4-pyrrolidino-N-methylpyridinium - 2- [5- (N-hydroxyethyl-2-pyridinylidene) -lformazano] -N-hydroxyethylpyridinium chloride - chloride of 2- [5- (N-hydroxyethyl-2-pyridin Ylidene) -3-methyl-1-formazano] -N-hydroxyethylpyridinium - 2- [5- (N-Hydroxyethyl-2-pyridinylidene) -3-ethyl-1-formazano] -N-hydroxyethylpyridinium chloride - Chloride 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3-phenyl-1-formazano] -N-hydroxyethyl-pyridinium. 2- [5- (N-Hydroxyethyl-2-pyridinylidene) -3-isopropyl-1-formazano] -N-hydroxyethyl-pyridinium chloride - 2- [5- (N-hydroxyethyl-2-pyridinylidene) chloride) 3- (4'-Methoxyphenyl) -1-formazano] -N-hydroxyethylpyridinium - 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] chloride N-hydroxyethylpyridinium - 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -N-hydroxyethylpyridinium chloride 2- [5- (N-carboxyethyl-2-pyridinylidene) -1-formazano] -N-carboxyethylpyridinium - 2- [5- (N-carboxyethyl-2-pyridinylidene) -3-methyl-1-formazano] chloride ] N-carboxyethylpyridinium-2- [5- (N-carboxyethyl-2-pyridinylidene) -3-ethyl-1-formazano] -N-carboxyethyl-pyridinium chloride-2- [5- (N-)] chloride carboxyethyl-2-pyridinylidene) -3-phenyl-1-formazano] -N-carboxyethyl-pyridinium-2- [5- (N-carboxyethyl-2-pyridinylidene) -3-isopropyl-1-formazano] -N- chloride carboxyethyl -Pyridinium-2- [5- (N-carboxyethyl-2-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -N-carboxyethylpyridinium chloride - 2- [5- (N-) -N carboxyethyl -2-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -N-carboxyethylpyridinium - 2- [5- (N-carboxyethyl-2-pyridinylidene) -3- N, N-dimethylaminophenyl) -1-formazano] -N-carboxyethylpyridinium. In a second preferred variant B, the compounds of formula (I) are chosen from the family defined by the compounds for which W 1 is a 4-pyridinium group and W 2 is a 4-pyridine group. Even more preferably, they are the following compounds - 4- [5- (N-methyl-4-pyridinylidene) -1-formazano] -N-methylpyridinium chloride - 4- [5- (N-methyl) 4-pyridinylidene) -3-methyl-1-formazano] -N-methylpyridinium - 4- [5- (N-methyl-4-pyridinylidene) -3-ethyl-1-formazano] -N-methylpyridinium chloride 4- [5- (N-methyl-4-pyridinylidene) -3-isopropyl-1-formazano] -N-methylpyridinium - 4- [5- (N-methyl-4-pyridinylidene) -3-phenyl] chloride - formazano] -N-methylpyridinium - 4- [5- (N-methyl-4-pyridinylidin) -3- (4'-methoxyphenyl) -1-formazano] -N-methylpyridinium chloride - 4- [5- (N-methyl-4-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -N-methylpyridinium - 4- [5- (N-methyl-4-pyridinylidene) -3- (4 ') chloride N, N-dimethylaminophenyl) -1-formazano] -N-methylpyridinium - 4- [5- (N-hydroxyethyl-4-pyridinylidene) -lformazano] -N-hydroxyethylpyridinium chloride - 4- [5- (N) -N -hydroxyethyl-4-pyridinylidéne) -3 1-methyl-1-formazano] -N-hydroxyethylpyridinium - 4- [5- (N-hydroxyethyl-4-pyridinylidene) -3-ethyl-1-formazano] -N-hydroxyethylpyridinium chloride - 4- [5-chloro] chloride - (N-Hydroxyethyl-4-pyridinylidene) -3-phenyl-1-formazano] -N-hydroxyethyl-pyridinium-4- [5- (N-hydroxyethyl-4-pyridinylidene) -3-isopropyl-1-formazanochloride ] N-hydroxyethylpyridinium 4- [5- (N-hydroxyethyl-4-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -N-hydroxyethylpyridinium chloride - 4- [4- (N-hydroxyethyl-4-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -N-hydroxyethylpyridinium chloride 5- (N-Hydroxyethyl-4-pyridinylidin) -3- (4'-hydroxyphenyl) -1-formazano] -N-hydroxyethylpyridinium - 4- [5- (N-hydroxyethyl-4-pyridinylidene) -3-chloride - (4'-N, N-dimethylaminophenyl) -1-formazano] -N-hydroxyethylpyridinium-4- [5- (N-carboxyethyl-4-pyridinylidene) -1-formazano] -N-carboxyethylpyridinium chloride 4- [5- (N-carboxyethyl-4-pyridinylidene) -3-methyl-1-formazano] -N-carboxyethyl-pyridinium chloride - 4- [5- (N-carboxyethyl) -4-pyridinylidyl chloride ene) -3-ethyl-1-formazano] -N-carboxyethylpyridinium - 4- [5- (N-carboxyethyl-4-pyridinylidene) -3-phenyl-1-formazano] -N-carboxyethylpyridinium chloride - 4- [5- (N-carboxyethyl-4-pyridinylidene) -3-isopropyl-1-formazano] -N-carboxyethyl-pyridinium chloride-4- [5- (N-carboxyethyl-4-pyridinylidene) -3-chloride - (4'-Methoxyphenyl) -1-formazano] -N-carboxyethylpyridinium - 4- [5- (N-carboxyethyl-4-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] chloride N-carboxyethylpyridinium 4- [5- (N-carboxyethyl-4-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -N-carboxyethyl pyridinium chloride. In a third preferred variant C, the compounds of formula (I) are chosen from the family defined by the compounds for which W 1 is a 2-imidazolium group and W 2 is a 2-imidazole group. Even more preferably, they are the following compounds: - 2- [5- (1,3-dimethyl-2-imidazolidene) -lformazano] -1,3-dimethylimidazolium chloride-2- [5- (1,3-dimethyl-2-imidazolidene) -3-methyl-1-formazano] -1,3-dimethylimidazolium-2- [5- (1,3-dimethyl-2-imidazolidene) chloride) ethyl-1-formazano] -1,3-dimethylimidazolium - 2- [5- (1,3-dimethyl-2-imidazolidene) -3-isopropyl-1-formazano] -1,3-dimethylimidazolium chloride - 2- [5- (1,3-Dimethyl-2-imidazolidene) -3-phenyl-1-formazano] -1,3-dimethylimidazolium chloride - 2- [5- (1,3-dimethyl) chloride 2-imidazolidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dimethylimidazolium - 2- [5- (1,3-dimethyl-2-imidazolidene) -3- chloride ( 4'-hydroxyphenyl) -1-formazano] -1,3-dimethylimidazolium-2- [5- (1,3-dimethyl-2-imidazolidene) -3- (4'-N, N-dimethylaminophenyl) chloride) 1-Formazano] -1,3-dimethyl-imidazolium - 2- [5- (1,3-dihydroxyethyl-2-imidazolidene) -1-formazano] -1,3-diol chloride dihydroxyethylimidazolium - 2- [5- (1,3-dihydroxyethyl-2-imidazolidene) -3-methyl-1-formazano] -1,3-dihydroxyethylimidazolium chloride - 2- [5- (1,3-dihydroxyethyl) chloride 2-imidazolidene) -3-ethyl-1-formazano] -1,3-dihydroxyethylimidazolium - 2- [5- (1,3-dihydroxyethyl-2-imidazolidene) -3-phenyl-1-formazano] chloride 1,3-dihydroxyethylimidazolium-2- [5- (1,3-dihydroxyethyl-2-imidazolidene) -3-isopropyl-1-formazano] -1,3-dihydroxyethylimidazolium chloride - 2- [5-chloro] chloride - (1,3-Dihydroxyethyl-2-imidazolidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dihydroxyethylimidazolium - 2- [5- (1,3-dihydroxyethyl) -2-dihydroxyethyl chloride imidazolidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dihydroxyethylimidazolium - 2- [5- (1,3-dihydroxyethyl) -2-imidazolidene) -3- (4 '-hydroxyethyl) imidazolium chloride N, N-dimethylaminophenyl) -1-formazano] -1,3-dihydroxyethylimidazolium-2- [5- (1,3-dicarboxyethyl-2-imidazolidene) -lformazano] -1,3-dicarboxyethylimidazolium chloride - Chloride of 2 - [5- (1,3-dicarboxyethyl-2-imidazolidene) -3-methyl-1-formazano] -1,3-dicarboxyethylimidazolium - 2- [5- (1,3-dicarboxyethyl) -2-imidazolidene chloride ) -3-ethyl-1-formazano] -1,3-dicarboxyethylimidazolium-2- [5- (1,3-Dicarboxyethyl-2-imidazolidene) -3-phenyl-1-formazano] -1,3-dichloroate -dicarboxyethyl-imidazolium-2- [5- (1,3-dicarboxyethyl-2-imidazolidene) -3-isopropyl-1-formazano] -1,3-dicarboxyethylimidazolium chloride - 2- [5- (1H-dicarboxyethyl) -imidazolium chloride 3-dicarboxyethyl-2-imidazolidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dicarboxyethylimidazolium - 2- [5- (1,3-dicarboxyethyl) -2-imidazolidene) chloride 3- (4'-hydroxyphenyl) -1-formazano] -1,3-dicarboxyethylimidazolium - 2- [5- (1,3-dicarboxyethyl) -2-imidazolidene) -3- (4'-N) chloride, N-dimethylaminophenyl) -1-formazano] -1,3-dicarboxyethyl imidazolium. In a fourth preferred variant D, the compounds of formula (I) are chosen from the family defined by the compounds for which W 1 is a 5-pyrazolium group and W 2 is a 5-pyrazole group. Even more preferably, they are the following compounds: - 5- [5- (1,2-dimethyl-5-pyrazolidene) -1-formazano] -1,2-dimethyl-pyrazolinium chloride - 5- [5- 5- (1,2-Dimethyl-5-pyrazolidene) -3-methyl-1-formazano] -1,2-dimethyl-pyrazolinium - 5- [5- (1,2-dimethyl-5-pyrazolidene) chloride] 3-ethyl-1-formazano] -1,2-dimethyl-pyrazolinium - 5- [5- (1,2-dimethyl-5-pyrazolidene) -3-isopropyl-1-formazano] -1,2-dimethyl chloride -pyrazolinium - 5- [5- (1,2-dimethyl-5-pyrazolidene) -3-phenyl-1-formazano] -1,2-dimethyl-pyrazolinium chloride - 5- [5- (1,2) -chloride 5-dimethyl-5-pyrazolidene) -3- (4'-methoxyphenyl) -1 -formazano] -1,2-dimethylpyrazolinium 5- (5- (1,2-dimethyl-5-pyrazolidene) chloride) - (4'-Hydroxyphenyl) -1-formazano] -1,2-dimethyl-pyrazolinium - 5- [5- (1,2-dimethyl-5-pyrazolidene) -3- (4'-N, N) chloride dimethylaminophenyl) -1-formazano] -1,2-dimethylpyrazolinium chloride - 5- [5- (1,2-dihydroxyethyl-5-pyrazolidene) -1-formazano] chloride 1,2-dihydroxyethylpyrazolinium chloride - 5- [5- (1,2-dihydroxyethyl-5-pyrazolidene) -3-methyl-1-formazano] -1,2-dihydroxyethylpyrazolinium chloride - 5- [5- (1) chloride, 2-Dihydroxyethyl-5-pyrazolidene) -3-ethyl-1-formazano] -1,2-dihydroxyethylpyrazolinium - 5- [5- (1,2-dihydroxyethyl-5-pyrazolidene) -3-phenyl] chloride -formazano] -1,2-dihydroxyethyl-pyrazolinium -N- [5- (1,2-dihydroxyethyl-5-pyrazolidene) -3-isopropyl-1-formazano] -1,2-dihydroxyethyl-pyrazolinium chloride - Chloride 5- [5- (1,2-dihydroxyethyl-5-pyrazolidene) -3- (4'-methoxyphenyl) -1-formazano] -1,2-dihydroxyethylpyrazolinium chloride 5- [5- (1,2-dihydroxyethyl-5-pyrazolidene) -3- (4'-methoxyphenyl) -1-formazano] -1,5-dihydroxyethylpyrazolinium chloride Dihydroxyethyl-5-pyrazolidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,2-dihydroxyethylpyrazolinium - 5- [5- (1,2-dihydroxyethyl-5-pyrazolidene) -3-chloride - (4'-N, N-dimethylaminophenyl) -1-formazano] -1,2-dihydroxyethylpyrazolinium-5- [5- (1,2-dicarboxyethyl-5-pyrazolidene) -1-formazano] chloride -dicarboxyethylpyrazolinium - Chloride 5- [5- (1,2-dicarboxyethyl-5-pyrazolidene) -3-methyl-1-formazano] -1,2-dicarboxyethylpyrazolinium - 5- [5- (1,2-dicarboxyethyl) -5-chloride pyrazolidene) -3-ethyl-1-formazano] -1,2-dicarboxyethylpyrazolinium-5- [5- (1,2-dicarboxyethyl-5-pyrazolidene) -3-phenyl-1-formazano] chloride 2-dicarboxyethylpyrazolinium - 5- [5- (1,2-dicarboxyethyl-5-pyrazolidene) -3-isopropyl-1-formazano] -1,2-dicarboxyethylpyrazolinium chloride - 5- [5- [5- [5- (1,2-dicarboxyethyl-5-pyrazolidene)] -3-isopropyl-1-formazano] chloride (1,2-dicarboxyethyl-5-pyrazolidene) -3- (4'-methoxyphenyl) -1-formazano] -1,2-dicarboxyethylpyrazolinium - 5- [5- (1,2-dicarboxyethyl) -5- chloride pyrazolidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,2-dicarboxyethylpyrazolinium. 5- [5- (1,2-dicarboxyethyl-5-pyrazolidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,2-dicarboxyethyl pyrazolinium chloride In a fifth preferred variant E the compounds of formula (I) are chosen from the family defined by the compounds for which W 1 is a 2-benzimidazolium group and W 2 is a 2-pyridine group. Even more preferably, they are the following compounds: 2- [5- (N-methyl-2-pyridinylidene) -1-formazano] -1,3-dimethylbenzimidazolium chloride - 2- [5- ( N-methyl-2-pyridinylidene) -3-methyl-1-formazano] -1,3-dimethylbenzimidazolium - 2- [5- (N-methyl-2-pyridinylidene) -3-ethyl-1-formazano chloride ] -1,3-dimethylbenzimidazolium - 2- [5- (N-methyl-2-pyridinylidin) -3-isopropyl-1-formazano] -1,3-dimethylbenzimidazolium chloride - 2- [5-chloro] chloride - (N-methyl-2-pyridinylidene) -3-phenyl-1-formazano] -1,3-dimethylbenzimidazolium - 2- [5- (N-methyl-2-pyridinylidene) -3- (4 ') chloride methoxyphenyl) -1-formazano] -1,3-dimethylbenzimidazolium - 2- [5- (N-methyl-2-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1 chloride 3-Dimethylbenzimidazolium - 2- [5- (N-methyl-2-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (N-Hydroxyethyl-2-pyridinylidene) -1-formazano] -1,3-dihydroxyethylbenzimidazolium chloride - 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3-methyl] chloride 1-formazano] -1,3-dihydroxyethylbenzimidazolium - 2- [5- (N-hydroxyethyl-2-pyridinylidin) -3-ethyl-1-formazano] -1,3-dihydroxyethylbenzimidazolium chloride - 5- (N-Hydroxyethyl-2-pyridinylidene) -3-phenyl-1-formazano] -1,3-dihydroxyethylbenzimidazolium - 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3-isopropyl] chloride 1-formazano] -1,3-dihydroxyethylbenzimidazolium - 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dihydroxyethyl chloride - benzimidazolium - 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dihydroxyethylbenzimidazolium chloride - 2- [5- (N) -chloride 2-hydroxy-2-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dihydroxyethylbenzimidazolium; 2- [5- (N-carboxyethyl) chloride; 2-pyridinylidene) -1-formazano] -1,3-dicarboxyethylbenzimidazolium - 2- [5- (N-carboxyethyl-2-pyridinylidene) -3-methyl-1-formazano] -1,3-dicarboxyethyl chloride benzimidazolium - 2- [5- (N-carboxyethyl-2-pyridinylidene) -3-ethyl-1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride - 2- [5- (N-carboxyethyl) -2- chloride pyridinylidene) -3-phenyl-1-formazano] -1,3-dicarboxyethylbenzimidazolium - 2- [5- (N-carboxyethyl-2-pyridinylidene) -3-isopropyl-1-formazano] -1,3-chloroimidazolium chloride dicarboxyethylbenzimidazolium - 2- [5- (N-carboxyethyl-2-pyridinylidin) -3-4'-methoxyphenyl) -1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride - 2- [5- ( N-carboxyethyl-2-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dicarboxyethylbenzimidazolium - 2- [5- (N-carboxyethyl-2-pyridinylidene) -3- chloride (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dicarboxyethyl benzimidazolium. In a sixth preferred variant F, the compounds of formula (I) are chosen from the family defined by the compounds for which W 1 is a 2-benzimidazolium group and W 2 is a 4-pyridine group.

Even more preferably, they are the following compounds: 2- [5- (N-methyl-4-pyridinylidene) -1-formazano] -1,3-dimethylbenzimidazolium chloride - 2- [5- (N-methyl-4-pyridinylidene) -3-methyl-1-formazano] -1,3-dimethylbenzimidazolium - 2- [5- (N-methyl-4-pyridinylidene) -3-ethyl-1-chloride formazano] -1,3-dimethylbenzimidazolium - 2- [5- (N-methyl-4-pyridinylidene) -3-isopropyl-1-formazano] -1,3-dimethylbenzimidazolium chloride - 2- [2- 5- (N-methyl-4-pyridinylidene) -3-phenyl-1-formazano] -1,3-dimethylbenzimidazolium-2- [5- (N-methyl-4-pyridinylidene)] chloride 1-methoxyphenyl) -1-formazano] -1,3-dimethylbenzimidazolium 2- [5- (N-methyl-4-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] chloride 3-Dimethylbenzimidazolium - 2- [5- (N-methyl-4-pyridinylidin) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dimethylbenzimidazolium chloride - 2- [5- (N-hydroxyethyl-4-pyridinylidene) -1-formazano] chloride -1,3-Dihydroxyethylbenzimidazolium - 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3-methyl-1-formazano] -1,3-dihydroxyethylbenzimidazolium chloride - 2- [5- (N-hydroxyethyl) chloride 4-pyridinylidene) -3-ethyl-1-formazano] -1,3-dihydroxyethylbenzimidazolium - 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3-phenyl-1-formazano] chloride 3-dihydroxyethylbenzimidazolium - 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3-isopropyl-1-formazano] -1,3-dihydroxyethylbenzimidazolium chloride - 2- [5- (N) -N 4-hydroxyethyl-4-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dihydroxyethylbenzimidazolium - 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3- 4'-hydroxyphenyl) -1-formazano] -1,3-dihydroxyethylbenzimidazolium - 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1 -chloride -formazano] -1,3-dihydroxyethylbenzimidazolium - 2- [5- (N-carboxyethyl-4-pyridinylidene) -1-formazano] -1,3-dicarboxyethylbenzimidazole chloride m - 2- [5- (N-carboxyethyl-4-pyridinylidene) -3-methyl-1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride - 2- [5- (N-carboxyethyl) -4- chloride pyridinylidene) -3-ethyl-1-formazano] -1,3-dicarboxyethylbenzimidazolium - 2- [5- (N-carboxyethyl-4-pyridinylidene) -3-phenyl-1-formazano] -1,3-chlorimidazolium chloride dicarboxyethylbenzimidazolium - 2- [5- (N-carboxyethyl-4-pyridinylidene) -3-isopropyl-1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride - 2- [5- (N-carboxyethyl) chloride 4-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dicarboxyethylbenzimidazolium - 2- [5- (N-carboxyethyl-4-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride hydroxyphenyl) -1-formazano] -1,3-dicarboxyethylbenzimidazolium. 2- [5- (N-carboxyethyl-4-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride In a seventh preferred variant G, the compounds of formula (I) are chosen from the family defined by the compounds for which W 1 is a 2-imidazolium group and W 2 is a 2-pyridine group. Even more preferably, they are the following compounds: 2- [5- (N-methyl-2-pyridinylidene) -1-formazano] -1,3-dimethylimidazolium chloride-2- [5- ( N-methyl-2-pyridinylidene) -3-methyl-1-formazano] -1,3-dimethylimidazolium - 2- [5- (N-methyl-2-pyridinylidene) -3-ethyl-1-formazano chloride 1, 3-dimethylimidazolium-2- [5- (N-methyl-2-pyridinylidin) -3-isopropyl-1-formazano] -1,3-dimethylimidazolium chloride - 2- [5-chloro] chloride - (N-methyl-2-pyridinylidene) -3-phenyl-1-formazano] -1,3-dimethylimidazolium - 2- [5- (N-methyl-2-pyridinylidene) -3- (4 ') chloride methoxyphenyl) -1-formazano] -1,3-dimethylimidazolium-2- [5- (N-methyl-2-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1 chloride, 3-dimethylimidazolium-2- [5- (N-methyl-2-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dimethylimidazolium chloride. - 2- [5- (N-Hydroxyethyl-2-pyridinylidene) -1-formazano] -1,3-dihydroxyethylimidazolium chloride - 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3-methyl] chloride 1-formazano] -1,3-dihydroxyethylimidazolium - 2- [5- (N-hydroxyethyl-2-pyridinylidin) -3-ethyl-1-formazano] -1,3-dihydroxyethylimidazolium chloride - 2- [ 5- (N-Hydroxyethyl-2-pyridinylidene) -3-phenyl-1-formazano] -1,3-dihydroxyethylimidazolium-2- [5- (N-hydroxyethyl-2-pyridinylidene) -3-isopropyl] chloride 1-formazano] -1,3-dihydroxyethylimidazolium - 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dihydroxyethylimidazolium chloride 2- [5- (N-Hydroxyethyl-2-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dihydroxyethylimidazolium chloride - 2- [5- (N-) -N hydroxyethyl-2-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dihydroxyethylimidazolium-2- [5- (N-carboxyethyl-2-pyridinylidene) chloride) lformazano] -1 , 3-dicarboxyethylimidazolium - 2- [5- (N-carboxyethyl-2-pyridinylidene) -3-methyl-1-formazano] -1,3-dicarboxyethylimidazolium chloride - 2- [5- (N) chloride -carboxyethyl-2-pyridinylidene) -3-ethyl-1-formazano] -1,3-dicarboxyethylimidazolium - 2- [5- (N-carboxyethyl-2-pyridinylidene) -3-phenyl-1-formazano] chloride 1,3-Dicarboxyethylimidazolium - 2- [5- (N-carboxyethyl-2-pyridinylidin) -3-isopropyl-1-formazano] -1,3-dicarboxyethylimidazolium chloride - 2- [5- (N-carboxyethyl-2-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dicarboxyethylimidazolium - 2- [5- (N-carboxyethyl-2-pyridinylidene) -3-chloride - (4'-Hydroxyphenyl) -1-formazano] -1,3-dicarboxyethylimidazolium - 2- [5- (N-carboxyethyl-2-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) chloride In a preferred eighth variant H, the compounds of formula (I) are chosen from the family defined by the compounds for the compound of formula (I). W1 is a 2-imidazolium group and W2 is a 4-pyridine group. Even more preferably, they are the following compounds - 2- [5- (N-methyl-4-pyridinylidene) -1-formazano] -1,3-dimethylimidazolium chloride-2- [5- ( N-methyl-4-pyridinylidene) -3-methyl-1-formazano] -1,3-dimethylimidazolium - 2- [5- (N-methyl-4-pyridinylidene) -3-ethyl-1-formazano chloride 1, 3-dimethylimidazolium-2- [5- (N-methyl-4-pyridinylidene) -3-isopropyl-1-formazano] -1,3-dimethylimidazolium chloride - 2- [5-chloro] chloride - (N-methyl-4-pyridinylidene) -3-phenyl-1-formazano] -1,3-dimethylimidazolium - 2- [5- (N-methyl-4-pyridinylidene) -3- (4 ') chloride methoxyphenyl) -1-formazano] -1,3-dimethylimidazolium-2- [5- (N-methyl-4-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1 chloride, 3-Dimethyl-imidazolium - 2- [5- (N-methyl-4-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dimethylimidazolium chloride - Chloride 2- [5- (N-hydroxyethyl-4-pyridinylidene) -1-formazano] -1,3-dihydroxyethylimidazolium - 2- [5- (N-Hydroxyethyl-4-pyridinylidin) -3-methyl-1-formazano] -1,3-dihydroxyethylimidazolium chloride - 2- [5- (N-Hydroxy-4-pyridinylidene) -3-chloride 1-ethyl-1-formazano] -1,3-dihydroxyethylimidazolium - 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3-phenyl-1-formazano] -1,3-dihydroxyethylimidazolium chloride 2- [5- (N-Hydroxyethyl-4-pyridinylidin) -3-isopropyl-1-formazano] -1,3-dihydroxyethylimidazolium chloride - 2- [5- (N-hydroxyethyl-4-pyridinylidene) chloride 3- [4- (4'-methoxyphenyl) -1-formazano] -1,3-dihydroxyethylimidazolium - 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3- (4'-hydroxyphenyl) -l] chloride -formazano] -1,3-dihydroxyethylimidazolium - 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1.3 chloride 2- [5- (N-carboxyethyl-4-pyridinylidene) -1-formazano] -1,3-dicarboxyethylimidazolium chloride - 2- [5- (N-carboxyethyl) -4-pyridinylidene chloride] -dihydroxyethylimidazolium chloride ) -3-methyl-1- formazano] -1,3-dicarboxyethylimidazolium - 2- [5- (N-carboxyethyl-4-pyridinylidin) -3-ethyl-1-formazano] -1,3-dicarboxyethylimidazolium chloride - 2- [ 5- (N-carboxyethyl-4-pyridinylidene) -3-phenyl-1-formazano] -1,3-dicarboxyethylimidazolium-2- [5- (N-carboxyethyl-4-pyridinylidene) -3-isopropyl) chloride 1-formazano] -1,3-dicarboxyethylimidazolium - 2- [5- (N-carboxyethyl-4-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dicarboxyethyl chloride imidazolium - 2- [5- (N-carboxyethyl-4-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dicarboxyethylimidazolium chloride - 2- [5- (N) -chloride -carboxyethyl-4-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dicarboxyethyl imidazolium. In a ninth preferred variant I, the compounds of formula (I) are chosen from the family defined by the compounds for which W 1 is a 2-benzimidazolium group and W 2 is a 2-benzimidazole group. Even more preferably, it is the following compounds: - 2- [5- (1,3-Dimethyl-2-benzimidazolidene) -lformazano] -1,3-dimethyl-benzimidazolium chloride - 2- [5- (1,3-dimethyl-2-) chloride benzimidazolidene) -3-methyl-1-formazano] -1,3-dimethylbenzimidazolium - 2- [5- (1,3-dimethyl-2-benzimidazolidene) -3-ethyl-1-formazano] -1 chloride, 3-dimethylbenzimidazolium - 2- [5- (1,3-dimethyl-2-benzimidazolidene) -3-isopropyl-1-formazano] -1,3-dimethylbenzimidazolium chloride - 2- [5- 1,3-dimethyl-2-benzimidazolidene) -3-phenyl-1-formazano] -1,3-dimethylbenzimidazolium - 2- [5- (1,3-dimethyl-2-benzimidazolidene) -3- chloride 4'-methoxyphenyl) -1-formazano] -1,3-dimethylbenzimidazolium - 2- [5- (1,3-dimethyl-2-benzimidazolidene) chloride 3- (4'-hydroxyphenyl) -1-formazano] -1,3-dimethylbenzimidazolium - 2- [5- (1,3-dimethyl-2-benzimidazolidene) -3- (4'-N) chloride N, N-dimethylaminophenyl) -1-formazano] -1,3-dimethylbenzimidazolium - 2- [5- (1,3-dihydroxyethyl-2-benzimidazolidene) -lformazano] -1,3-dihydroxyethylbenzimidazolium chloride 2- [5- (1,3-Dihydroxyethyl-2-benzimidazolidene) -3-methyl-1-formazano] -1,3-dihydroxyethylbenzimidazolium - 2- [5- (1,3-dihydroxyethyl-2-benzimidazolidene) chloride) 3-ethyl-1-formazano] -1,3-dihydroxyethylbenzimidazolium - 2- [5- (1,3-dihydroxyethyl-2-benzimidazolidene) -3-15-phenyl-1-formazano] -1.3 chloride -dihydroxyethyl-benzimidazolium - 2- [5- (1,3-dihydroxyethyl-2-benzimidazolidene) -3-isopropyl-1-formazano] -1,3-dihydroxyethyl-benzimidazolium chloride - 2- [5- (1H-dihydroxyethyl) -benzimidazolium chloride 3-dihydroxyethyl-2-benzimidazolidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dihydroxyethylbenzimidazolium 2- [5- (1,3-dihydroxyethyl) -2-benzimidazl chloride olidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dihydroxyethylbenzimidazolium - 2- [5- (1,3-dihydroxyethyl-2-benzimidazolidene) -3- (4'-dihydroxyethyl) benzimidazolium chloride N, N-dimethylaminophenyl) -1-formazano] -1,3-dihydroxyethylbenzimidazolium 2- (5- (1,3-dicarboxyethyl-2-benzimidazolidene) -1-formazano] -1,3-dicarboxyethyl chloride -benzimidazolium - 2- [5- (1,3-dicarboxyethyl-2-benzimidazolidene) -3-methyl-1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride - 2- [5- (1,3-benzyl) chloride -dicarboxyethyl-2-benzimidazolidene) -3-30 ethyl-1-formazano] -1,3-dicarboxyethylbenzimidazolium - 2- [5- (1,3-dicarboxyethyl-2-benzimidazolidene) -3-phenyl] chloride -formazano] -1,3-dicarboxyethylbenzimidazolium - 2- [5- (1,3-dicarboxyethyl-2-benzimidazolidene) -3-isopropyl-1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride - Chloride 2- [5- (1,3-dicarboxyethyl-2-benzimidazolidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dicarboxyethylbenzimidazolium - 2- [5- ( 1,3-dicarboxyethyl-2-benzimidazolidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dicarboxyethylbenzimidazolium - 2- [5- (1,3-dicarboxyethyl) -2-benzimidazolidene chloride 3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dicarboxyethylbenzimidazolium. Among all the compounds described above, the compounds of family A (first variant) will be particularly preferred.

In the compositions of the invention, the compound or compounds of formula (I) are preferably present in an amount ranging from 0.001 to 10% by weight, and preferably from 0.05 to 5% by weight, and even more preferably from 0.1 to 3% by weight relative to the total weight of the composition.

The compounds of formula (I) can in particular be obtained by a process in which at least two equivalents of at least one hydrazone chosen from the hydrazones of formula (A) and the hydrazones of formula (B) are reacted: formula A x In which Z14, Z15, Z16, R25 respectively have the same meanings as Z7, Z8, Z13, R5 of the formula (IV), Y being an organic or inorganic anion, where x is an integer ranging from 1 to 3, Z17, Z18, Z19, Z20, R26, R27 have the same meanings respectively as Z9, Z10, Z11, Z12, R8, R7 of the formula (V), Y 'being an organic or inorganic anion, x' being an integer from 1 to 3, with one equivalent of an aldehyde of formula R23CHO, R23 having the same meaning as Ro of formula (I). It is thus possible to react two equivalents of the same hydrazone or of two different hydrazones. According to a preferred variant, the aldehyde of formula R23CHO is generated in the reaction medium from an aldehyde precursor of formula R'23CH2OH in the presence of an oxidizing system, R'23 then has the same meaning as Ro from formula (I).

This oxidizing system may be a chemical oxidant or a biocatalytic oxidant such as an enzyme. In particular, the process for preparing the compound of formula (I) according to the present invention may be carried out in the presence of an aldehyde precursor of formula R'23CH2OH and at least one enzyme capable of generating an aldehyde from the aldehyde precursor of formula R'23CH2OH. The method for synthesizing the compounds of formula (I) enzymatically defined above is carried out by reacting at least two equivalents of at least one hydrazone chosen from the hydrazones of formula (A) and the hydrazones of formula (B in which: Z14, Z15, Z16, R25 respectively have the same meanings as Z7, Z8, Z13, R5 of the formula (IV), Y being an organic or inorganic anion, x being an integer ranging from 1 to 3, Z17 , Z18, Z19, Z20, R26, R27 have the same meanings respectively as Z9, Z10, Z11, Z12, R8, R7 of the formula (V), Y 'being an organic or inorganic anion, x' being an integer ranging from 1 to 3, with one equivalent of an aldehyde of formula R23CHO, R23 having the same meaning as Ro of formula (I). Depending on the reagents used, the reaction is carried out with or without an oxidizing system, with or without a cofactor for the enzyme, with or without a cofactor regeneration system.

For the purposes of the present application, the term "without oxidizing system" means that no oxidizing system other than atmospheric oxygen is used. Preferably, the reaction is carried out under aerobic conditions at a pH of between 3 and 11 and at a temperature of between 6 ° C. and 80 ° C. More generally, the aldehyde precursor that can be used to prepare the compound of formula (I) can be chosen from primary alcohols, sarcosine, 4-hydroxymandelate, N6-methyl-lysine, dimethylglycine, methylglutamate, 2-oxo acids, for example 2-oxo-acid pyruvate, benzoylformate, phenylpyruvate, threonine. Preferably, it will be selected from primary alcohols. The enzymes capable of generating an aldehyde from this aldehyde precursor can be chosen from alcohol dehydrogenases EC 1.1.1.1, alcohol dehydrogenases EC 1.1.1.2, alcohol dehydrogenases EC 1.1.1.71, aromatic alcohol dehydrogenases EC 1.1.1.90 also referred to as aryl alcohol dehydrogenases, aromatic alcohol dehydrogenases EC 1.1.1.97, alcohol 3-hydroxybenzyl dehydrogenases EC 1.1.1.97, alcohol coniferylic dehydrogenases EC 1.1.1.194, cinnamyl alcohol dehydrogenases EC 1.1.1.195, methanol dehydrogenases EC 1.1.1.244, the aromatic alcohol oxidases EC 1.1.3.7 also called aryl alcohol oxidases, the alcohol oxidases EC 1.1.3.13, the 4-hydroxymandelate oxidases EC 1.1.3.19, the long chain alcohol hydrocarbon oxidases EC 1.1.3.20, the methanol oxidases EC 1.1.3.31, alcohol dehydrogenases EC 1.1.99.20, sarcosinase oxidases EC 1.5.3.1, N6-methyl-lysine oxidases EC 1. 5.3.4, dimethylglycine oxidases EC 1.5.3.10, sarcosine dehydrogenases EC 1.5.99.1, dimethylglycine dehydrogenases EC 1.5.99.2, methylglutamate dehydrogenases EC 1.5.99.5, 2-oxoacids decarboxylases EC 4.1.1.1, benzoylformate decarboxylases EC 4.1.1.7, phenylpyruvate decarboxylases EC 4.1.1.43, threonine aldolase EC 4.1.2.5.

Mention may also be made of the following enzymes capable of generating an aldehyde whose preferred substrate is specified between parentheses: N-methyl L amino acid oxidase EC 1.5.3.2 (N-methyl-L-amino acid), trimethylamine dehydrogenase EC 1.5. 99.7 (trimethylamine), dimethylamine dehydrogenase EC 1.5.99.10 (dimethylamine), nitroethane oxidase EC 1.7.3.1 (nitroethane), indole 2,3-dioxygenase EC 1.13.11.17 (indole), taurine dioxygenase EC 1.14. 11.17 (taurine), acetoin ribose 5 phosphate transaldolase EC 2.2.1.4 (3-hydroxybutan-2-one), diamine aminotransferase EC 2.6.1.29 (alpha omega diamine + 2-oxoglutate), alkenylglycerophosphocholine hydrolase EC 3.3. 2.2 (alkenylglycerophosphocholine), alkenylglycerophosphoethanolamine hydrolase EC 3.3.2.5 (alkenylglycerophosphocholine), alkylalidase EC 3.8.1.1 (halomethane), phosphonoacetaldehyde hydrolase EC 3.11.1.1 (phosphonoacetaldehyde), indolepyruvate decarboxylase EC 4.1.1.74 (3-indol-3-yl pyruvate), mandelonitrile lyase EC 4.1.2.10 (mandelonitrile), hydroxymandelonitrile lyase EC 4.1.2.11 (hydroxymandelonitrile), ketopantoaldolase EC 4.1.2.12 (2-hydroxyl-2-isopropylbutanedioate ), dimethylaniline-N-oxide aldolase EC 4.1.2.24 (dimethylaniline-N-oxide), phenylserine aldolase EC 4.1.2.26 (phenylserine), sphinganine-1-phosphate aldolase EC 4.1.2.27 (sphinganine-1-phosphate) , 17-alpha hydroxyprogesterone aldolase EC 4.1.2.30 (17-alpha hydroxyprogesterone), trimethylamine oxide aldolase EC 4.1.2.23 (trimethylamine oxide), fucosterol epoxide lyase EC 4.1.2.23 (fucosterol epoxide), (3E) -4- ( 2-carboxyphenyl) -2-oxobut-3-enoate aldolase EC 4.1.2.34 ((3E) -4- (2-carboxyphenyl) -2-oxobut-3-enoate), the lactate aldolase EC 4.1.2.36 (lactate), benzoin aldolase EC 4.1.2.38 (benzoin), octoamine dehydratase EC 4.2.1.87 (1- (4-hydroxyphenyl) 2-aminoethanol), synephrine dehydratase EC 4.2.1.88 (1- (4-hydroxyl) yphenyl) -2- (methylamino) ethanol), ethanolaminephosphate phospholase EC 4.2.3.2 (ethanolamine-phosphate), ethanolamine ammonia-lyase EC 4.3.1.7 (ethanolamine), dichloromethane dehalogenase EC 4.5.1.3 ( dichloromethane), styrene oxide isomerase EC 5.3.99.7 (styrene oxide) The enzyme capable of generating an aldehyde from the aldehyde precursor used in the composition for bleaching and simultaneous coloration according to the invention may be derived from an extract of plants, animals, microorganisms (bacterium, fungus, yeast, microalgae) or viruses, differentiated or dedifferentiated cells, obtained in vivo or in vitro, modified or non-genetically modified, or synthetic (obtained by chemical synthesis or biotechnology). By way of examples of useful enzymes, mention may in particular be made of the genera Plectranthus, Pinus, Gastropoda, Manduca, Pichia, Candida, Pleurotus, Pseudomonas, and even more particularly the following species: Plectranthus colleoides, Pinus strobus which is a species of plant origin, Gastropod mollusc, Manduca sexta which are of animal origin, Pichia pastoris and Candida boidinii which are yeasts, Pleurotus pulmonarius which is a fungus, and Pseudomonas pseudoalcaligenes which is a bacterium. The choice of enzyme is a function of the nature of the aldehyde precursor. For example, when the aldehyde precursor is an alcohol, then the enzyme is selected from the enzymes capable of generating an aldehyde from that alcohol. When the aldehyde precursor is methylglutamate, then the enzyme is a methylglutamate dehydrogenase.

According to a preferred variant, the aldehyde precursor is a primary alcohol and the enzyme is an enzyme capable of generating the aldehyde from an alcohol. For example, when the primary alcohol is a C1 to C6 aliphatic alcohol, then the enzyme capable of generating the aldehyde is selected from alcohol oxidases, alcohol dehydrogenases, methanol dehydrogenases, methanol oxidases. When the primary alcohol is benzyl alcohol, 4-tert-butyl benzyl alcohol, 3-hydroxy-4-methoxybenzyl alcohol, veratryl alcohol, 4-methoxybenzyl alcohol, cinnamic alcohol, 2,4 hexadien-1 -ol, aryl alcohol oxidases or aromatic alcohol dehydrogenases can be used as aldehyde precursors. For dehydrogenase enzymes, it is essential to include the cofactor (s) necessary for their activity, specifically the oxidized form of nicotinamide adenine dinucleotide (NAD +) or nicotinamide adenine dinucleotide phosphate (NADP +) or other molecules capable of acting as an electron acceptor. The addition of a cofactor regeneration system can be used for reaction or economic reasons. This regeneration system can be enzymatic, chemical or electrochemical. The most diverse oxidants are used for the implementation of this process: hydrogen peroxide, organic peracids such as peracetic acid, persalts such as permanganate, perborate, persulfates, chromates or dichromates, hypochlorites , hypobromites, ferricyanides, peroxides such as manganese or lead oxides. Oxygenated water is preferably used. The substrate concentration of the enzyme (aldehyde precursor) can be between 0.001 mol / l. (or M) and 6 M, preferably between 0.1 M and 4 M. The reaction can be carried out at a pH ranging from 3 to 11, preferably from 5 to 9.5. The temperature for the reaction may be from 10 ° C to 80 ° C, preferably from 20 ° C to 65 ° C. The concentration of hydrazone in the reaction medium is between 0.01 M and 3 M, preferably between 0.1 M and 1 M. The cofactor content for said enzymes may be between 0.01 mmol / l. (or mM) and 1 M, preferably 0.1 mM and 10 mM. When carrying out the synthesis of the compounds of formulas (I), the reagents, that is to say the one or more hydrazones, the enzyme or enzymes, the substrate for said enzyme, and / or the cofactor for said enzyme, and / or the oxidant and / or the cofactor regeneration system are mixed, and the pH and temperature are adjusted. The compounds of formula (I) can also be obtained by a process in which a compound of formula (F1) or (F2) R25 Z16 / NZ, wherein R24 formula F1 is reacted with Z14, Z15, Z16, Ro, R24. , R25 for the formula (F1) and Z17, Z18, Z19, Z20, Ro, R24, R26 for the formula (F2) having the meanings described above, in the presence of one equivalent of a hydrazone of the formula (A) or (B). According to a preferred variant, the compounds of formula (F1) or (F2) can be obtained by reaction of a compound of formula R "23C (OR24) 3 and a hydrazone of formula (A) or (B) in the presence or not a protic solvent whose boiling point varies between 66 ° C and 180 ° C. R "23 has the same meaning as Ro of the formula (I) and R24 represents a group selected from methyl groups and ethyl. Preferably, the reaction is carried out in the presence of triethylorthoformate and trimethylorthoacetate at a temperature between 0 ° C and 150 ° C for a period of between 20 minutes and 12 hours. Preferably, the protic solvent is selected from H2O, ethanol and methanol.

The peroxygenated salt (s) that can be used in the composition according to the invention are especially chosen from persulfates, 4 perborates, percarbonates and peroxides of alkali or alkaline-earth metals, and mixtures thereof. Preferably, the peroxygenated salt or salts are chosen from alkali or alkaline earth metal persulfates, and mixtures thereof, and more particularly from sodium persulfate, potassium persulfate and mixtures thereof. The peroxygenated salt or salts are present in the composition according to the invention in an amount ranging preferably from 10 to 70% by weight, more preferably from 20 to 60% by weight relative to the total weight of the composition.

The alkali agent (s) that can be used in the composition according to the invention are chosen from silicates, phosphates, carbonates or hydroxides of alkali or alkaline-earth metals, ammonia, alkanolamines and their derivatives such as monoethanolamine and 2-amino-2-methyl-1-propanol, and mixtures thereof. As examples of alkali or alkaline earth metals, there may be mentioned lithium, sodium, potassium, magnesium, calcium and barium. By alkali agent precursor is meant any compound capable of generating an alkaline agent in the ready-to-use aqueous composition obtained by mixing, for example, a composition according to the anhydrous invention with an aqueous composition containing, for example, an oxidizing agent such as hydrogen peroxide. Preferably, the generated agent is ammonia. Preferably, the alkali precursors are ammonium salts such as ammonium chloride, ammonium sulfate, ammonium phosphate and ammonium nitrate.

Preferably, the alkaline agent (s) and / or the alkali metal precursor (s) are chosen from ammonium chloride, alkali metal or alkaline-earth metal silicates, such as sodium metasilicate or sodium disilicate, carbonates. alkali or alkaline earth metals, and mixtures thereof.

The alkali agent (s) and / or alkali precursor (s) are present in the composition according to the invention in an amount ranging preferably from 0.01 to 40% by weight, more preferably from 0.1 to 30% by weight relative to the total weight of the composition.

Advantageously, the composition according to the invention is anhydrous. By "anhydrous" is meant a composition having a water content of less than 1% by weight, and preferably less than 0.5% by weight relative to the total weight of the composition. The anhydrous composition can be a powder or a paste. Preferably, the composition is a paste. In the case where the composition according to the invention is in the form of paste, it may further comprise at least one organic inert liquid phase. By inert liquid phase is meant in the sense of the present invention any phase capable of flow at room temperature, generally between 15 ° C and 40 ° C, and under atmospheric pressure, under the action of its own weight. By way of examples of inert liquid phase, mention may be made of polydecenes of formula C1onH [(2on) +2] in which n varies from 3 to 9 and preferably from 3 to 7, esters of fatty alcohols or of fatty acids, esters or diesters of C12-C24 fatty acid sugars, cyclic ethers or cyclic esters, silicone oils, mineral oils or vegetable oils, or mixtures thereof. Compounds of formula Clon H [(2o0 + 2) with n varying from 3 to 9 correspond to the name "polydecene" of the CTFA Dictionary 7th edition, 1997 of the Cosmetic, Toiletry and Fragrance Association, USA, as well as to the same INCI name in the USA and in Europe.These are poly-1-decene hydrogenation products Among these compounds, it is preferred according to the invention for which in the formula, n varies from 3 to 7.

Mention may be made, by way of example, of the product sold under the name Silkflo 366 NF Polydecene by the company Amoco Chemical, those sold under the name Nexbase 2002 FG, 2004 FG, 2006 FG and 2008 FG by the company Fortum.

With regard to the esters of fatty alcohols or of fatty acids, mention may be made by way of examples: esters of linear or branched C 3 -C 6 saturated monohydric alcohols with monofunctional C12-C24 fatty acids the latter may be linear or branched, saturated or unsaturated and chosen in particular from oleates, laurates, palmitates, myristates, behenates, cocoates, stearates, linoleates, linolenates, caprates, arachidonates, or mixtures thereof, such as in particular oleopalmitates and oleostearates. and palmito-stearates. Among these esters, it is more particularly preferred to use isopropyl palmitate, isopropyl myristate and octyl-dodecyl stearate. esters of linear or branched C 3 -C 8 monohydric alcohols with bifunctional C 8 -C 24 fatty acids, the latter possibly being linear or branched, saturated or unsaturated, such as, for example, the isopropyl di-ester of sebacic acid, called also diisopropyl sebacate, esters of linear or branched C 3 -C 8 monohydric alcohols, with bifunctional fatty acids C 2 -C 6, the latter being linear or branched, saturated or unsaturated, such as, for example, di-adipate; octyl and di-caprylyl maleate; the ester of a trifunctional acid such as triethyl citrate. With regard to the esters and diesters of C12-C24 fatty acid sugars, the term "sugar" means compounds which have several alcohol functions, with or without an aldehyde or ketone function, and which comprise at least 4 atoms. of carbon. These sugars can be monosaccharides, oligosaccharides or polysaccharides. As sugars that can be used according to the invention, mention may be made, for example, of sucrose, glucose, galactose, ribose, fuctose, maltose, fructose, mannose, arabinose, xylose, lactose and their derivatives. especially alkylated, such as methylated derivatives such as methylglucose. The esters of sugars and of fatty acids that may be used according to the invention may be chosen in particular from the group comprising the esters or mixtures of sugar esters described above and linear or branched, saturated C12-C24 fatty acids. or unsaturated. The esters may be chosen from mono-, di-, tri- and tetraesters, polyesters and mixtures thereof. These esters may be, for example, chosen from oleates, laurates, palmitates, myristates, behenates, cocoates, stearates, linoleates, linolenates, caprates, arachidonates, or mixtures thereof, such as in particular mixed oleo-palmitate, oleostearate or palmito-stearate esters. . More particularly, it is preferred to use the mono- and diesters and especially the mono- or dioleates, stearates, behenates, oleopalmitates, linoleates, linolenates or oleostearates, sucrose, glucose or methylglucose. By way of example, mention may be made of the product sold under the name Glucate DO by the company Amerchol, which is a methylglucose dioleate. Mention may also be made, by way of examples, of esters or mixtures of esters of fatty acid sugar: the products sold under the names F160, F140, F110, F90, F70 and SL40 by the company Crodesta, respectively denoting saccharose palmito-stearates of 73% monoester and 27% di- and tri-ester, 61% monoester and 39% di-, tri- and tetraester, 52% monoester and 48% di-, tri- and tetraester, 45% monoester and 55% di-, tri- and tetraester, 39% monoester and 61% di-, tri- and tetraester , and sucrose mono-laurate; the products sold under the name Ryoto Sugar Esters, for example referenced B370 and corresponding to sucrose behenate formed from 20% monoester and 80% di-triester-polyester; the sucrose mono-dipalmito-stearate marketed by Goldschmidt under the name Tegosoft PSE. Examples of suitable cyclic ethers and cyclic esters are γ-butyrolactone, dimethylisosorbide or diisopropylisosorbide. Silicone oils can also be used as an inert organic liquid phase. More particularly, the suitable silicone oils are liquid and non-volatile silicone fluids with a viscosity of less than or equal to 10,000 mPa.s at 25 ° C., the viscosity of the silicones being measured according to ASTM Standard 445 Appendix C. The oils of Silicone are further defined in Walter Noll's "Chemistry and Technology of Silicones" (1968) - Academic Press.

Among the silicone oils that may be used according to the invention, mention may be made in particular of the silicone oils sold under the names DC-200 fluid-5 mPas, DC-200 fluid-20 mPas, DC-200 fluid-350 mPa. .s, DC-200 fluid-1000 mPa.s, DC-200 fluid-10,000 mPa.s by the company Dow Corning.

The mineral oils can also be used as organic inert liquid phase, for example paraffin oil. Vegetable oils may also be suitable, including avocado oil, olive oil or liquid jojoba wax. Preferably, the organic inert liquid phase is chosen from the group formed by polydecenes of formula ClOnH [(20n) +2] in which n varies from 3 to 9 and preferably from 3 to 7, the esters of fatty alcohols or fatty acids, and mixtures thereof. According to one particular embodiment of the invention, the organic inert liquid phase content varies from 5 to 60% by weight, preferably from 10 to 50% by weight relative to the weight of the anhydrous paste, and even more preferably from 15 to 45%.

According to a particular embodiment of the invention, the composition according to the invention further comprises hydrogen peroxide. When the composition according to the invention contains hydrogen peroxide, it is generally aqueous and its pH is generally between 3 and 11. It is preferably between 7 and 11. It is then a composition ready to employment. The composition according to the present invention may also comprise one or more additives conventionally used in cosmetics.

These additives may be inorganic or organic thickeners, and in particular associative or non-associative thickening polymers, anionic, cationic, nonionic or amphoteric, fillers such as clays, binders such as vinylpyrrolidone, lubricants such as stearates, polyol or stearates of alkali or alkaline earth metals, hydrophilic or hydrophobic silicas, pigments, dyes other than those of the present invention, mattifying agents such as titanium oxides or alternatively anionic, nonionic and cationic surfactants , amphoteric or zwitterionic agents, antioxidants, penetrating agents, sequestering agents, buffers, dispersing agents, film-forming agents, preserving agents, opacifying agents, vitamins, perfumes, anionic, cationic, nonionic polymers ionic, amphoteric or zwitterionic, ceramides, conditioning agents such as, for example, volatile or non-volatile silicones, modified or unmodified. In the case where the composition according to the invention comprises hydrogen peroxide, it may also comprise agents for controlling the release of oxygen such as carbonate or magnesium oxide.

The additives and oxygen release control agents as defined above may be present in an amount for each of them ranging from 0.01 to 40% by weight, preferably from 0.1 to 30% by weight relative to to the total weight of the composition.

Of course, one skilled in the art will take care to choose this or these optional additional compounds in such a way that the advantageous properties intrinsically attached to the composition according to the invention are not, or not substantially, impaired by the addition or additions considered. Another subject of the invention is a process for bleaching and simultaneous coloration comprising mixing an anhydrous composition as defined above, in the form of a paste or a powder, with an aqueous solution of hydrogen peroxide and applying of the mixture obtained on the keratinous fibers. The present invention also relates to a multi-compartment device, containing at least two compositions whose mixture leads to a composition containing hydrogen peroxide according to the invention as defined above.

According to a particular embodiment of the invention, the device according to the invention comprises a first compartment which contains a composition (A) comprising, in a medium suitable for dyeing, one or more cationic direct dyes of formula (I) such that defined above, a second compartment which contains an anhydrous composition (B) comprising one or more peroxygenated salts and one or more alkaline agents and / or one or more precursors of alkaline agents as defined above, and a third compartment which contains an aqueous composition (E) of hydrogen peroxide. According to another particular embodiment of the invention, the device according to the invention comprises a first compartment which contains an anhydrous composition (C) comprising one or more cationic direct dyes of formula (I) as defined above, one or several peroxygenated salts and one or more alkaline agents and / or one or more precursors of alkaline agents as defined above, and a second compartment which contains an aqueous composition (E) of hydrogen peroxide. According to another particular embodiment of the invention, the device according to the invention comprises a first compartment which contains an anhydrous composition (B) comprising one or more peroxygenated salts and one or more alkaline agents and / or one or more precursors of alkaline agents as defined above, and a second compartment which contains a composition (D) comprising, in a medium suitable for dyeing, one or more cationic direct dyes of formula (I) as defined above and peroxide of hydrogen. The medium suitable for dyeing compositions (A) and (D) generally consists of water or a mixture of water and one or more organic solvents. As examples of organic solvent, there may be mentioned, for example, C 1 -C 4 alcohols such as ethanol and isopropanol; glycerol; glycols and glycol ethers such as 2-butoxyethanol, propylene glycol, propylene glycol monomethyl ether; as well as aromatic alcohols such as benzyl alcohol or phenoxyethanol; and their mixtures.

The solvents may be present in proportions of preferably between 1 and 40% by weight relative to the total weight of the bleaching and coloring composition, and more preferably between 5 and 30% by weight approximately. The composition (A), also called "booster", may be formulated at acidic, neutral or alkaline pH, the pH may vary between 3 and 12 approximately and preferably between 4 and 11 approximately. The composition (D) preferably has a pH of less than 7, the acidic pH guaranteeing the stability of the hydrogen peroxide in this composition. The compositions (A) and (D) may be in various forms, such as in the form of liquids, creams, gels, or in any other form suitable for dyeing keratinous fibers. The anhydrous compositions (B) and (C) can be in the form of powder or paste. In the case of pastes, they also preferably comprise an organic inert liquid phase as indicated above.

The aqueous (E) hydrogen peroxide composition preferably has a pH of less than 7, the acidic pH guaranteeing the stability of the hydrogen peroxide in this composition. The compositions (A), (B), (C), (D) and (E) may also contain one or more additives conventionally used in cosmetics such as those described above. Compositions (E) and (D) may further comprise oxygen release control agents as defined above. The following examples are intended to illustrate the invention. The proportions given in the tables below are expressed in grams of active ingredient (M.A.).

EXAMPLE 1 An anhydrous powder was prepared from the following ingredients: Colorant of the invention N + N N NO N N N CI Potassium persulfate Sodium persulfate Sodium metasilicate Ammonium chloride EDTA Dioctyl sulfosuccinate / benzoate of sodium 1 Calcium stearate 1 Silica 7 40 g were mixed. of this anhydrous powder at 80 g. of the following aqueous composition: Cetearyl alcohol / ceteareth 30 2.85 Stabilizers 0.06 Sequestering agents 0.15 Hydrogen peroxide 200 volumes 9 Phosphoric acid qs pH 2 Water qs 100 A bleaching and coloring cream ready for use 'employment. It was applied for 45 minutes at room temperature (about 20 ° C) on dark natural hair. At the end of the break time, the hair is well cleared. The locks were rinsed, shampooed and rinsed and dried. A tint was obtained in a powerful and homogeneous blue shade.

EXAMPLE 2 An anhydrous powder was prepared from the following ingredients: Dye of the invention N, N N N N H 0) OH CI Potassium persulfate 41.3 Sodium disilicate 18 Ammonium chloride 2.2 EDTA 0.2 Ammonium Sulphate 2 Potato Carboxymethyl Starch / Sodium Salt 1 Weakly Crosslinked (') Copolymer Hexamethyl Diisocyanate / 0.5 Polyethylene Glycol with a-Termination and (T) Stearyl Polyoxyethylene (2 Guar Gum 0.5 Xanthan Gum 2 Titanium oxide 1 Sodium cetostearyl sulphate 2 Sodium lauryl sulphate 2 Magnesium stearate 2 Isopropyl myristate 24.2 Silica 0.6 (1) sold under AVEBE the trade name Primogel by the company (2) sold under the trade name SER-AD FX 1100 by Servo Delden

40 g were mixed. of this anhydrous powder at 80 g. of the following aqueous composition: Cetearyl alcohol / ceteareth 30 2.85 Stabilizers 0.06 Sequestering agents 0.15 Hydrogen peroxide 200 volumes 9 Phosphoric acid qs pH 2 Water qs 100 A bleaching and coloring cream ready for use 'employment. It was applied for 45 minutes at room temperature (about 20 ° C) on dark natural hair.

At the end of the break time, the hair is well cleared. The locks were rinsed, shampooed and rinsed and dried. A tint was obtained in a powerful and homogeneous blue shade.

Claims (41)

1. Composition for the bleaching and the simultaneous dyeing of keratinous fibers, in particular of human keratinous fibers, and more particularly of hair, comprising: (i) one or more tetraazapentamethine cationic direct dyes of formula (I) RWN = NOCO (I) ) Wherein W 1 represents a cationic heteroaromatic group of formula (II) or (III): R 3 X -I 4 X -W 2 represents a heteroaromatic group of formula (IV) or (V): R 8 (V) ) in which: Zo represents a nitrogen atom, -CR2- or -NR21-, Z1 represents an oxygen or sulfur atom, -NR9-, or -CR13-, Z2 represents a nitrogen atom or -CR10 -, Z3 represents a nitrogen atom or -CR11-, Z4 represents a nitrogen atom or -CR12-, Z5 represents a nitrogen atom, -CR3- or a carbon atom, Z6 represents an atom of nitrogen or -CR14-, Z7 represents an oxygen or sulfur atom, -NR15- or -CR19-, Z8 represents a nitrogen atom or -CR16-, Z9 represents a nitrogen atom or -CR17-, Zlo represents a nitrogen atom or -CR18-, -Zn represents a nitrogen atom, -CR8- or a carbon atom, - Z12 represents a nitrogen atom or - CR20-, 20 -Z13 represents a group -CR6-, a nitrogen atom or -NR22-, it being understood that each of the rings of the formulas (II), (III), (IV) and (V) do not comprise more of three nitrogen atoms, and two of the three nitrogen atoms may be contiguous, the cationic 5-membered heteroaromatic linkage of the formula (II) being connected to the nitrogen atom N1 of the formula (I), the bond b of the cationic heteroaromatic 6-membered group of the formula (III) being connected to the nitrogen atom N1 of the formula (I), the double bond of the 5-membered heteroaromatic group of the wherein formula (IV) is attached to the nitrogen atom N 2 of formula (I), the double bond b 'of the 6-membered heteroaromatic group of formula (V) being connected to the nitrogen atom N 2 of the formula ( I), the bond b connecting the cationic heteroaromatic group of formula (III) to the nitrogen atom N1 of formula (I) being located: in the ortho position of the nitrogen atom carrying the group R4 when Z5 is -CR3-, or • in the para position of the nitrogen atom carrying the R4 group when Z5 is a carbon atom, or • in the ortho position of the nitrogen atom carrying the R4 group when Z5 represents a nitrogen atom, the bond b 'connecting the heteroaromatic group of the formula (V) to the nitrogen atom N2 of the formula (I) being located: in the ortho position of the atom nitrogen bearing the group R7 when Z1I is -CR8-, or • in the para position of the nitrogen atom carrying the R7 group when Z11 is a carbon atom, or • in the ortho position of the nitrogen atom carrying the R7 group when Z11 is a nitrogen atom, R2, R6, Rlo, R13, R16 and R19 are each independently of one another a hydrogen atom; a linear or branched C1-C4 alkyl group unsubstituted or substituted with one to three groups selected from hydroxy, C1-C2 alkoxy, (C2-C4) poly (hydroxy) alkoxy, amino, (di) (alkyl) C1-C2) amino, carboxy or sulfonic; a phenyl group unsubstituted or substituted with one to three groups selected from hydroxy, C1-C2 alkoxy, (C2-C4) poly (poly) hydroxyalkoxy, amino and (di) (C1-C2alkyl) amino; a carboxy group; or a sulfoamino group (HO3S-NH-); R1, R4, R5, R7, R9, R15, R21, and R22 each represent, independently of one another, a linear or branched C1-C8 alkyl group unsubstituted or substituted by one to three groups selected from hydroxy, (C1-C2) alkoxy, (C2-C4) poly (hydroxy) alkoxy, amino, (di) (C1-C2 alkyl) amino, carboxy and sulfonic; Ro, R3, R8, R11, R12, R14, R17, R18 and R20 each represent, independently of one another, a hydrogen atom; a linear, branched or cyclic C1-C16 hydrocarbon chain, this chain possibly being saturated or unsaturated by one to three unsaturations, this chain being unsubstituted or substituted by one to three groups chosen from hydroxyl, C1-C2 alkoxy, ( C2-C4 poly) -hydroxyalkoxy, amino, (di) (C1-C2alkyl) amino, carboxy, sulfonic, sulfoamino and (poly) -hydroxyalkylamino C2-C4, and halogen atoms such as chlorine, fluorine and bromine; the hydrocarbon chain may be further interrupted by one or two oxygen atoms, nitrogen, sulfur or a group SO2; a linear or branched C1-C4 alkoxy group unsubstituted or substituted by one to two hydroxy groups; a phenyl group unsubstituted or substituted with one to three groups selected from hydroxy, C 1 -C 2 alkoxy, C 2 -C 4 (poly) hydroxyalkoxy, amino, (di) (C 1 -C 2) alkylamino, carboxy and sulfonic, and halogen atoms such as chlorine, fluorine and bromine; a 5- or 6-membered aromatic heterocyclic group selected from pyrazolyl, pyrrolyl, imidazolyl, thiazolyl, oxazolyl, triazolyl, pyridinyl, pyrimidinyletriazinyl, pyrazinyl and pyridazinyl and their cationic equivalents for which the nitrogen atom or one of the atoms bears a C1-C6 alkyl group; a sulfoamino group (HO3S-NH-); a carboxy group; an amino group; a (di) (C1-C4) alkylamino group; a C2-C4 (poly) hydroxyalkylamino group; it being understood that Ro, R3, R8, R11, R12, R14, R17, R18 and R20 do not have a peroxide bond, nor diazo or nitroso groups, R2 with R10, R11 with R12, R6 with R16, and R17 with R18. capable of forming, independently of one another, a 5- or 6-membered carbon aromatic ring unsubstituted or substituted by one or two of hydroxy, amino, (di) (C1-C2alkyl) amino, C1-C2alkoxy, (poly ) C2-C4 hydroxyalkyl amino, and X- is an organic or inorganic anion; (ii) one or more peroxygenated salts, and (iii) one or more alkaline agents and / or one or more alkali precursors. 2. Composition according to claim 1, characterized in that in the formula (I), Z1 represents an oxygen atom -NR9- or -CR13-, and Z7 represents an oxygen atom, -NR15- or -CR19- . 55 3. Composition according to claim 1 and 2, characterized in that Ro represents a hydrogen atom; a linear or branched C1-C6 alkyl group unsubstituted or substituted with one to three groups selected from hydroxy, C1-C2 alkoxy, (C2-C4) poly (poly) hydroxyalkoxy, amino, (di) (alkyl) C1-C2) amino, (poly) hydroxyalkylamino C2-C4, carboxy and sulfonic; a phenyl group unsubstituted or substituted with one to three groups selected from hydroxyl, C 1 -C 2 alkoxy, C 2 -C 4 (poly) hydroxyalkoxy, amino, (di) (C 1 -C 2) alkylamino, carboxy and sulfonic, and halogen atoms such as chlorine, fluorine and bromine; a 5- or 6-membered aromatic heterocyclic group selected from pyrazolyl, pyrrolyl, imidazolyl, thiazolyl, oxazolyl, triazolyl, pyridinyl, pyrimidinyl, triazinyl, pyrazinyl and pyridazinyl and their cationic equivalents for which the nitrogen atom or the one of the 20 atoms bears a C1-C6 alkyl group. 4. Composition according to claim 3, characterized in that Ro represents a hydrogen atom; a methyl, ethyl, isopropyl or 2-methoxyethyl group; a phenyl group unsubstituted or substituted by hydroxy, methoxy, amino, (di) methylamino or (di) (2-hydroxyethyl) amino; a 5- or 6-membered aromatic heterocyclic group chosen from imidazolyl and pyridinyl groups and their cationic equivalents for which the nitrogen atom or one of the atoms bears a C1-C6 alkyl group. 30 5. Composition according to any one of the preceding claims, characterized in that R2, R6, Rio, R13, R16 and R19 each represent, independently of one another, a hydrogen atom; a C1-C4 alkyl group unsubstituted or substituted with one of two groups selected from hydroxy, amino and (di) (C1-C2alkyl) amino; a phenyl group; or a carboxy group; or R2. with Rlo and R6 with R16 together form, independently of each other, an aryl group. 6. Composition according to claim 5, characterized in that R2, R6, Rlo, R13, R16 and R19 each represent, independently of one another, a hydrogen atom; a methyl, 2-hydroxyethyl, phenyl or carboxy group; or alternatively R2 with R1 and R6 with R16 together, independently of one another, form a phenyl group. 7. Composition according to any one of the preceding claims, characterized in that R1, R4, R5, R7, R9, R15, R21 and R22 each represent, independently of one another, a C1-C4 alkyl group. unsubstituted or substituted by one to two groups selected from hydroxy, C1-C2alkoxy, amino, (di) (C1-C2alkyl) amino, carboxy and sulfonic. 8. Composition according to claim 7, characterized in that R1, R4, R5, R7, R9, R15, R21 and R22 each represent, independently of one another, a methyl, ethyl, 2-hydroxyethyl, 1 -carboxyméthyle; 2-carboxyethyl or 2-sulfoethyl. 9. A composition according to any one of the preceding claims wherein R3, R8, R11, R12, R14, R17, R13 and R20 are each, independently of one another, a hydrogen atom; a linear or branched C1-C4 alkyl group unsubstituted or substituted by one to two groups selected from hydroxy, C1-C2 alkoxy, (poly) -hydroxyalkoxy C2-C4, amino, (di) (alkyl) C1-C2) amino, carboxy and sulfonic; a linear or branched C1-C4 alkoxy group unsubstituted or substituted by one to two hydroxy groups; a C4-05 cycloalkyl group interrupted by a nitrogen atom; a phenyl group unsubstituted or substituted with one of two groups selected from hydroxyl, C 1 -C 2 alkoxy, C 2 -C 4 (poly) hydroxyalkoxy, amino, (di) (C 1 -C 2) alkylamino, carboxy and sulfonic groups; , and halogen atoms such as chlorine, fluorine and bromine; a sulfoamino group (HO3S-NH-); a carboxy group; an amino group; a (di) (C1-C4 alkyl) amino group; or a (poly) -hydroxyalkylamino C2-C4 group. 10. Composition according to claim 9, characterized in that R3, R8, R11, R12, R14, R17, R18, and R20 each represent, independently of one another, a hydrogen atom, a methyl group, 2 hydroxyethyl, pyrrolidine, carboxy, methoxy, ethoxy, 2-hydroxyethyloxy, amino, methylamino, dimethylamino or 2-hydroxyethylamino. 11. Composition according to any one of the preceding claims, characterized in that W1 is a 2-pyridinium group and W2 is a 2-pyridine group. 12. Composition according to claim 11, characterized in that the compound of formula (I) is chosen from the following compounds: - 2- [5- (N-methyl-2-pyridinylidene) -1-formazano] chloride - N -méthylpyridinium. 2- [5- (N-methyl-2-pyridinylidene) -3-methyl-1-formazano] -N-methylpyridinium chloride. 2- [5- (N-methyl-2-pyridinylidene) -3-ethyl-1-formazano] -N-methylpyridinium chloride. 2- [5- (N-methyl-2-pyridinylidene) -3-isopropyl-1-formazano] -N-methylpyridinium chloride. 2- [5- (N-methyl-2-pyridinylidene) -3-phenyl-1-formazano] -N-methylpyridinium chloride. 2- [5- (N-methyl-2-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -N-methylpyridinium chloride. 2- [5- (N-methyl-2-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -N-methylpyridinium chloride. 2- [5- (N-methyl-2) chloride -pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -N-methylpyridinium. 2- [5- (4-Pyrrolidino-N-methyl-2-pyridinylidene) -1-formazano] -4-pyrrolidino-N-methylpyridinium chloride. 2- [5- (4-Pyrrolidino-N-methyl-2-pyridinylidene) -3-methyl-1-formazano] -4-pyrrolidino-N-methylpyridinium chloride. 2- [5- (4-Pyrrolidino-N-methyl-2-pyridinylidene) -3-ethyl-1-formazano] -4-pyrrolidino-N-methylpyridinium chloride. 2- [5- (4-Pyrrolidino-N-methyl-2-pyridinylidene) -3-isopropyl-1-formazano] -4-pyrrolidino-N-methylpyridinium chloride. 2- [5- (4-Pyrrolidino-N-methyl-2-pyridinylidene) -3-phenyl-1-formazano] -4-pyrrolidino-N-methylpyridinium chloride. 2- [5- (4-Pyrrolidino-N-methyl-2-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -4-pyrrolidino-N-methylpyridinium chloride. 2- [5- (4-Pyrrolidino-N-methyl-2-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -4-pyrrolidino-N-methylpyridinium chloride. 2- [5- (4-Pyrrolidino-N-methyl-2-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -4-pyrrolidino-N-methylpyridinium chloride. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -1-formazano] -N-hydroxyethylpyridinium chloride. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3-methyl-1-formazano] -N-hydroxyethylpyridinium chloride. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3-ethyl-1-formazano] -N-hydroxyethyl-pyridinium chloride. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3-phenyl-1-formazano] -N-hydroxyethyl-pyridinium chloride. 2- [5- (N-hydroxyethyl -2-pyridinylidene) -3-isopropyl-1-formazano] -N-hydroxyethylpyridinium chloride. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -N-hydroxyethylpyridinium chloride. 2- [5- (N-hydroxyethyl -2-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -N-hydroxyethylpyridinium chloride. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -N-hydroxyethyl pyridinium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -1-formazano] -N-carboxyethyl-pyridinium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3-methyl-1-formazano] -N-carboxyethyl-pyridinium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3-ethyl-1-formazano] -N-carboxyethylpyridinium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3-phenyl-1-formazano] -N-carboxyethyl-pyridinium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3-isopropyl-1-formazano] -N-carboxyethylpyridinium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -N-carboxyethylpyridinium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -N-carboxyethylpyridinium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -N-carboxyethyl-pyridinium chloride. 13. Composition according to any one of claims 1 to 10, characterized in that W 1 is a 2-imidazolium group and W 2 is a 2-imidazole group. 14. Composition according to claim 13, characterized in that the compound of formula (I) is chosen from the following compounds: - 2- [5- (1,3-dimethyl-2-imidazolidene) -1-formazano chloride] -1,3-dimethyl-imidazolium. 2- [5- (1,3-Dimethyl-2-imidazolidene) -3-methyl-1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (1,3-Dimethyl-2-imidazolidene) -3-ethyl-1-formazano] -1,3-dimethyl imidazolium chloride. 2- [5- (1,3-Dimethyl) -2- dimethyl-2-imidazolidene) -3-isopropyl-1-formazano] -1,3-dimethylimidazolium. 2- [5- (1,3-Dimethyl-2-imidazolidene) -3-phenyl-1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (1,3-Dimethyl-2-imidazolidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (1,3-Dimethyl-2-imidazolidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (1,3-Dimethyl-2-imidazolidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (1,3-dihydroxyethyl-2-imidazolidene) -1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (1,3-dihydroxyethyl-2-imidazolidene) -3-methyl-1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (1,3-dihydroxyethyl-2-imidazolidene) -3-ethyl-1-formazano] -1,3-dihydroxyethylimidazolium chloride; 2- [5- (1,3-dihydroxyethyl) -imidazolium chloride; dihydroxyethyl-2-imidazolidene) -3-phenyl-1-formazano] -1,3-dihydroxyethylimidazolium. 2- [5- (1,3-Dihydroxyethyl-2-imidazolidene) -3-isopropyl-1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (1,3-Dihydroxyethyl-2-imidazolidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (1,3-dihydroxyethyl-2-imidazolidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dihydroxyethylimidazolium chloride, 2- [5- (1,3-Dihydroxyethyl-2-imidazolidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dihydroxyethylimidazolium. 2- [5- (1,3-dicarboxyethyl-2-imidazolidene) -lformazano] -1,3-dicarboxyethylimidazolium chloride. 2- [5- (1,3-dicarboxyethyl-2-imidazolidene) -3-methyl-1-formazano] -1,3-dicarboxyethylimidazolium chloride. 2- [5- (1,3-Dicarboxyethyl-2-imidazolidene) -3-ethyl-1-formazano] -1,3-dicarboxyethylimidazolium chloride. 2- [5- (1,3-Dicarboxyethyl-2-imidazolidene) -3-phenyl-1-formazano] -1,3-dicarboxyethylimidazolium chloride. 2- [5- (1,3-Dicarboxyethyl-2-imidazolidene) -3-isopropyl-1-formazano] -1,3-dicarboxyethylimidazolium chloride. 2- [5- (1,3-dicarboxyethyl-2-imidazolidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dicarboxyethylimidazolium chloride. 2- [5- (1,3-Dicarboxyethyl-2-imidazolidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dicarboxyethylimidazolium chloride. 2- [5- (1,3-dicarboxyethyl-2-imidazolidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dicarboxyethyl imidazolium chloride. 15. Composition according to any one of claims 1 to 10, characterized in that W1 is a 5-pyrazolium group and W2 is a 5-pyrazole group. 16. Composition according to claim 15, characterized in that the compound of formula (I) is chosen from the following compounds: 5- [5- (1,2-dimethyl-5-pyrazolidene) -1-formazano chloride] -1,2-dimethyl-pyrazolinium. 5- [5- (1,2-Dimethyl-5-pyrazolidene) -3-methyl-1-formazano] -1,2-dimethyl-pyrazolinium chloride. 5- [5- (1,2-Dimethyl-5-pyrazolidene) -3-ethyl-1-formazano] -1,2-dimethyl-pyrazolinium chloride. 5- [5- (1,2-Dimethyl-5-pyrazolidene) -3-isopropyl-1-formazano] -1,2-dimethyl-pyrazolinium chloride. 5- [5- (1,2-Dimethyl-5-pyrazolidene) -3-phenyl-1-formazano] -1,2-dimethyl-pyrazolinium chloride. 5- [5- (1,2-Dimethyl-5-pyrazolidene) -3- (4'-methoxyphenyl) -1-formazano] -1,2-dimethyl-pyrazolinium chloride. 5- [5- (1,2-Dimethyl-5-pyrazolidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,2-dimethyl-pyrazolinium chloride. 5- [5- (1,2-Dimethyl-5-pyrazolidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,2-dimethyl-pyrazolinium chloride. 5- [5- (1,2-dihydroxyethyl-5-pyrazolidene) -1-formazano] -1,2-dihydroxyethylpyrazolinium chloride. 5- [5- (1,2-dihydroxyethyl-5-pyrazolidene) -3-methyl-1-formazano] -1,2-dihydroxyethylpyrazolinium chloride. 5- [5- (1,2-Dihydroxyethyl-5-pyrazolidene) -3-5-ethyl-1-formazano] -1,2-dihydroxyethyl-pyrazolinium chloride. 5- [5- (1,2-Dihydroxyethyl-5-pyrazolidene) -3-phenyl-1-formazano] -1,2-dihydroxyethyl-pyrazolinium chloride. 5- [5- (1,2-Dihydroxyethyl-5-pyrazolidene) -3-isopropyl-1-formazano] -1,2-dihydroxyethyl pyrazolinium chloride. 5- [5- (1,2-Dihydroxyethyl-5-pyrazolidene) -3- (4'-methoxyphenyl) -1-formazano] -1,2-dihydroxyethyl-pyrazolinium chloride. 5- [5- (1,2-dihydroxyethyl-5-pyrazolidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,2-dihydroxyethyl-pyrazolinium chloride. 5- [5- (1,2-dihydroxyethyl-5-pyrazolidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,2-dihydroxyethyl pyrazolinium chloride. 5- [5- (1,2-dicarboxyethyl-5-pyrazolidene) -1-formazano] -1,2-dicarboxyethyl-pyrazolinium chloride. 5- [5- (1,2-dicarboxyethyl-5-pyrazolidene) -3-20 methyl-1-formazano] -1,2-dicarboxyethyl-pyrazolinium chloride. 5- [5- (1,2-dicarboxyethyl-5-pyrazolidene) -3-ethyl-1-formazano] -1,2-dicarboxyethyl-pyrazolinium chloride. 5- [5- (1,2-dicarboxyethyl-5-pyrazolidene) -3-phenyl-1-formazano] -1,2-dicarboxyethyl-pyrazolinium chloride. 5- [5- (1,2-Dicarboxyethyl-5-pyrazolidene) -3-isopropyl-1-formazano] -1,2-dicarboxyethyl-pyrazolinium chloride. 5- [5- (1,2-dicarboxyethyl-5-pyrazolidene) -3- (4'-methoxyphenyl) -1-formazano] -1,2-dicarboxyethyl-pyrazolinium chloride. 5- [5- (1,2-dicarboxyethyl-5-pyrazolidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,2-dicarboxyethyl-pyrazolinium chloride. 5- [5- (1,2-dicarboxyethyl-5-pyrazolidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,2-dicarboxyethyl pyrazolinium chloride. 17. Composition according to any one of claims 1 to 10, characterized in that W 1 is a 2-benzimidazolium group and W 2 is a 2-pyridine group. 18. Composition according to Claim 17, characterized in that the compound of formula (I) is chosen from the following compounds: - 2- [5- (N-methyl-2-pyridinylidene) -1-formazano] chloride 3-dimethylbenzimidazolium. 2- [5- (N-methyl-2-pyridinylidene) -3-methyl-1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (N-methyl-2-pyridinylidene) -3-ethyl-1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (N-methyl-2-pyridinylidene) -3-isopropyl-1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (N-methyl-2-pyridinylidene) -3-phenyl-1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (N-methyl-2-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (N-methyl-2-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (N-methyl-2-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -1-formazano] -1,3-dihydroxyethylbenzimidazolium chloride. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3-methyl-1-formazano] -1,3-dihydroxyethylbenzimidazolium chloride. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3-ethyl-1-formazano] -1,3-dihydroxyethyl-benzimidazolium chloride. 2- [5- (N-Hydroxyethyl-2-pyridinylidene) -3-phenyl-1-formazano] -1,3-dihydroxyethylbenzimidazolium chloride. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3-isopropyl-1-formazano] -1,3-dihydroxyethyl-benzimidazolium chloride. 2- [5- (N-Hydroxyethyl-2-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dihydroxyethylbenzimidazolium chloride. 2- [5- (N) -chloride 2-hydroxyethyl-2-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dihydroxyethyl-benzimidazolium. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dihydroxyethylbenzimidazolium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3-methyl-1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3-ethyl-1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3-phenyl-1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3-isopropyl-1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride. 19. Composition according to any one of claims 1 to 10, characterized in that Wi is a 2-imidazolium group and W2 is a 2-pyridine group. 20. Composition according to claim 19, characterized in that the compound of formula (I) is chosen from the following compounds: - 2- [5- (N-methyl-2-pyridinylidene) -1-formazano] chloride , 3-dimethyl-imidazolium. 2- [5- (N-methyl-2-pyridinylidene) -3-methyl-1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (N-methyl-2-pyridinylidene) -3-ethyl-1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (N-methyl-2-pyridinylidene) -3-isopropyl-1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (N-methyl-2-pyridinylidene) -3-phenyl-1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (N-methyl-2-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (N-methyl-2-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (N-methyl-2-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3-methyl-1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3-ethyl-1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3-phenyl-1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3-isopropyl-1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (N-hydroxyethyl-2-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -1-formazano] -1,3-dicarboxyethylimidazolium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3-methyl-1-formazano] -1,3-dicarboxyethylimidazolium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3-ethyl-1-formazano] -1,3-dicarboxyethylimidazolium chloride. 2- [5- (N-carboxyethyl) -2- chloride pyridinylidene) -3-phenyl-1-formazano] -1,3-dicarboxyethylimidazolium. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3-isopropyl-1-formazano] -1,3-dicarboxyethylimidazolium chloride. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dicarboxyethylimidazolium chloride; 2- [5- (N) -chloride -carboxyethyl-2-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dicarboxyethylimidazolium. 2- [5- (N-carboxyethyl-2-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dicarboxyethyl imidazolium chloride. 21. Composition according to any one of claims 1 to 10, characterized in that Wi is a 2-benzimidazolium group and W2 is a 2-benzimidazole group. 22. Composition according to Claim 21, characterized in that the compound of formula (I) is chosen from the following compounds: 2- [5- (1,3-Dimethyl-2-benzimidazolidene) -I-formazano] chloride - 1,3-dimethylbenzimidazolium. 2- [5- (1,3-Dimethyl-2-benzimidazolidene) -3-methyl-1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (1,3-Dimethyl-2-benzimidazolidene) -3-ethyl-1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (1,3-Dimethyl-2-benzimidazolidene) -3-isopropyl-1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (1,3-Dimethyl-2-benzimidazolidene) -3-phenyl-1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (1,3-Dimethyl-2-benzimidazolidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (1,3-Dimethyl-2-benzimidazolidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (1,3-Dimethyl-2-benzimidazolidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (1,3-dihydroxyethyl-2-benzimidazolidene) -1-formazano] -1,3-dihydroxyethylbenzimidazolium chloride. 2- [5- (1,3-dihydroxyethyl-2-benzimidazolidene) -3-5-methyl-1-formazano] -1,3-dihydroxyethylbenzimidazolium chloride. 2- [5- (1,3-dihydroxyethyl-2-benzimidazolidene) -3-ethyl-1-formazano] -1,3-dihydroxyethyl-benzimidazolium chloride. 2- [5- (1,3-dihydroxyethyl-2-benzimidazolidene) -3-phenyl-1-formazano] -1,3-dihydroxyethyl-benzimidazolium chloride. 2- [5- (1,3-Dihydroxyethyl-2-benzimidazolidene) -3-isopropyl-1-formazano] -1,3-dihydroxyethyl-benzimidazolium chloride. 2- [5- (1,3-dihydroxyethyl-2-benzimidazolidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dihydroxyethylbenzimidazolium chloride. 2- [5- (1,3-Dihydroxyethyl-2-benzimidazolidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dihydroxyethyl-benzimidazolium chloride. 2- [5- (1,3-dihydroxyethyl-2-benzimidazolidene) -3- (4'-N, N-dimethylaminophenyl) -1 -formazano] -1,3-dihydroxyethylbenzimidazolium chloride. 2- [5- (1,3-Dicarboxyethyl-2-benzimidazolidene) -1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride. 2- [5- (1,3-Dicarboxyethyl-2-benzimidazolidene) -3-methyl-1-formazano] -1,3-dicarboxyethyl-benzimidazolium chloride. 2- [5- (1,3-dicarboxyethyl-2-benzimidazolidene) -3-25 ethyl-1-formazano] -1,3-dicarboxyethyl-benzimidazolium chloride. 2- [5- (1,3-Dicarboxyethyl-2-benzimidazolidene) -3-phenyl-1-formazano] -1,3-dicarboxyethyl-benzimidazolium chloride. 2- [5- (1,3-Dicarboxyethyl-2-benzimidazolidene) -3-isopropyl-1-formazano] -1,3-dicarboxyethyl-benzimidazolium chloride. 2- [5- (1,3-Dicarboxyethyl-2-benzimidazolidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dicarboxyethyl-benzimidazolium chloride. 2- [5- (1,3-Dicarboxyethyl-2-benzimidazolidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dicarboxyethyl-benzimidazolium chloride. 2- [5- (1,3-dicarboxyethyl-2-benzimidazolidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dicarboxyethylbenzimidazolium. 23. Composition according to any one of the preceding claims, characterized in that the compound (s) of formula (I) are present in an amount ranging from 0.001% to 10% by weight and preferably from 0.05% to 5% by weight. by weight, better from 0.1 to 3% by weight relative to the total weight of the composition. 24. Composition for the bleaching and the simultaneous dyeing of keratinous fibers, in particular of human keratinous fibers, and more particularly of hair, comprising: (i) one or more tetraazapentamethine cationic direct dyes chosen from the following compounds: chloride of 4- [5- (N-methyl-4-pyridinylidène) -1-formazano] -N-methylpyridinium. 4- [5- (N-methyl-4-pyridinylidene) -3-methyl-1-formazano] -N-methylpyridinium chloride. 4- [5- (N-methyl-4-pyridinylidene) -3-ethyl-1-formazano] -N-methylpyridinium chloride. 4- [5- (N-methyl-4-pyridinylidene) -3-isopropyl-1-formazano] -N-methylpyridinium chloride. 4- [5- (N-methyl-4-pyridinylidene) -3-phenyl-1-formazano] -N-methylpyridinium chloride. 4- [5- (N-methyl-4-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -N-methylpyridinium chloride. 4- [5- (N-methyl-4-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -N-methylpyridinium chloride. 4- [5- (N-methyl-4-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -N-methylpyridinium chloride. 4- [5- (N-hydroxyethyl-4-pyridinylidene) -1-formazano] -N-hydroxyethylpyridinium chloride. 4- [5- (N-hydroxyethyl-4-pyridinylidene) -3-methyl-1-formazano] -N-hydroxyethylpyridinium chloride. 4- [5- (N-hydroxyethyl-4-pyridinylidene) -3-ethyl-1-formazano] -N-hydroxyethylpyridinium chloride. 4- [5- (N-hydroxyethyl-4-pyridinylidene) -3-phenyl-1-formazano] -N-hydroxyethyl-pyridinium chloride. 4- [5- (N-hydroxyethyl-4-pyridinylidene) -3-isopropyl-1-formazano] -N-hydroxyethylpyridinium chloride. 4- [5- (N-Hydroxyethyl-4-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -N-hydroxyethylpyridinium chloride. 4- [5- (N-hydroxyethyl-4-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -N-hydroxyethylpyridinium chloride. 4- [5- (N-hydroxyethyl-4-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -N-hydroxyethyl-pyridinium chloride. 4- [5- (N-carboxyethyl-4-pyridinylidene) -1-formazano] -N-carboxyethylpyridinium chloride. 4- [5- (N-carboxyethyl-4-pyridinylidene) -3-methyl-1-formazano] -N-carboxyethylpyridinium chloride. 4- [5- (N-carboxyethyl-4-pyridinylidene) -3-ethyl-1-formazano] -N-carboxyethylpyridinium chloride. 4- [5- (N-carboxyethyl-4-pyridinylidene) -3-phenyl-1-formazano] -N-carboxyethyl-pyridinium chloride. 4- [5- (N-carboxyethyl-4-pyridinylidene) -3-isopropyl-1-formazano] -N-carboxyethylpyridinium chloride. 4- [5- (N-carboxyethyl-4-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -N-carboxyethylpyridinium chloride. 4- [5- (N-carboxyethyl-4-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -N-carboxyethylpyridinium chloride. 4- [5- (N-carboxyethyl-4-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -N-carboxyethyl pyridinium chloride, (ii) one or more peroxygenated salts, and (iii) one or more alkaline agents and / or one or more alkali precursors. 25. Composition for the bleaching and the simultaneous dyeing of keratinous fibers, in particular of human keratinous fibers, and more particularly of hair, comprising: (i) one or more tetraazapentamethine cationic direct dyes chosen from the following compounds: - Chloride of 2- [5- (N-methyl-4-pyridinylidene) -1-formazano] -1,3-dimethylbenzimidazolium. 2- [5- (N-methyl-4-pyridinylidene) -3-methyl-1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (N-methyl-4-pyridinylidene) -3-ethyl-1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (N-methyl-4-pyridinylidene) -3-isopropyl-1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (N-methyl-4-pyridinylidene) -3-phenyl-1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (N-methyl-4-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (N-methyl-4-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (N-methyl-4-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dimethylbenzimidazolium chloride. 2- [5- (N-hydroxyethyl-4-pyridinylidene) -1-formazano] -1,3-dihydroxyethylbenzimidazolium chloride. 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3-methyl-1-formazano] -1,3-dihydroxyethylbenzimidazolium chloride. 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3-ethyl-1-formazano] -1,3-dihydroxyethyl-benzimidazolium chloride. 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3-phenyl-1-formazano] -1,3-dihydroxyethyl-benzimidazolium chloride. 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3-isopropyl-1-formazano] -1,3-dihydroxyethyl-benzimidazolium chloride. 2- [5- (N-Hydroxyethyl-4-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dihydroxyethylbenzimidazolium chloride. 2- [5- (N) -chloride 4-hydroxyethyl-4-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dihydroxyethyl-benzimidazolium. 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dihydroxyethylbenzimidazolium chloride. 2- [5- (N-carboxyethyl-4-pyridinylidene) -1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride. 2- [5- (N-carboxyethyl-4-pyridinylidene) -3-methyl-1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride. 2- [5- (N-carboxyethyl-4-pyridinylidene) -3-ethyl-1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride. 2- [5- (N-carboxyethyl-4-pyridinylidene) -3-phenyl-1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride. 2- [5- (N-carboxyethyl-4-pyridinylidene) -3-isopropyl-1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride, - 2- [5- (N-carboxyethyl) -4-pyridinylidene chloride ) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dicarboxyethylbenzimidazolium. 2- [5- (N-carboxyethyl-4-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride. 2- [5- (N-carboxyethyl-4-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dicarboxyethylbenzimidazolium chloride, (ii) one or more salts peroxygenated, and (iii) one or more alkaline agents and / or one or more alkali precursors. 26. Composition for the bleaching and the simultaneous dyeing of keratinous fibers, in particular of human keratinous fibers, and more particularly of hair, comprising (i) one or more tetraazapentamethine cationic direct dyes chosen from the following compounds: 5- (N-methyl-4-pyridinylidène) -1-formazano] -1,3-dimethyl-imidazolium. 2- [5- (N-methyl-4-pyridinylidene) -3-methyl-1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (N-methyl-4-pyridinylidene) -3-ethyl-1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (N-methyl-4-pyridinylidene) -3-isopropyl-1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (N-methyl-4-pyridinylidene) -3-phenyl-1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (N-methyl-4-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (N-methyl-4-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (N-methyl-4-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dimethylimidazolium chloride. 2- [5- (N-hydroxyethyl-4-pyridinylidene) -1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3-methyl-1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3-ethyl-1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3-phenyl-1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3-isopropyl-1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dihydroxyethylimidazolium chloride. 2- [5- (N-hydroxyethyl-4-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dihydroxyethyl imidazolium chloride. 2- [5- (N-carboxyethyl-4-pyridinylidene) -1-formazano] -1,3-dicarboxyethylimidazolium chloride. 2- [5- (N-carboxyethyl-4-pyridinylidene) -3-methyl-1-formazano] -1,3-dicarboxyethylimidazolium chloride. 2- [5- (N-carboxyethyl) -4- chloride pyridinylidene) -3-ethyl-1-formazano] -1,3-dicarboxyethylimidazolium. 2- [5- (N-carboxyethyl-4-pyridinylidene) -3-phenyl-1-formazano] -1,3-dicarboxyethylimidazolium chloride, - 2- [5- (N-carboxyethyl) -4-chlorohydrate pyridinylidene) -3-isopropyl-1-formazano] -1,3-dicarboxyethylimidazolium. 2- [5- (N-carboxyethyl-4-pyridinylidene) -3- (4'-methoxyphenyl) -1-formazano] -1,3-dicarboxyethylimidazolium chloride. 2- [5- (N-carboxyethyl-4-pyridinylidene) -3- (4'-hydroxyphenyl) -1-formazano] -1,3-dicarboxyethylimidazolium chloride. 2- [5- (N-carboxyethyl-4-pyridinylidene) -3- (4'-N, N-dimethylaminophenyl) -1-formazano] -1,3-dicarboxyethylimidazolium chloride, (ii) one or more peroxygenated salts, and (iii) one or more alkaline agents and / or one or more alkali precursors. 27. Composition according to any one of the preceding claims, characterized in that the peroxygenated salt or salts are chosen from persulfates, perborates, percarbonates and peroxides of alkali or alkaline earth metals, and mixtures thereof. 28. Composition according to Claim 27, characterized in that the peroxygen salt or salts are chosen from alkali or alkaline earth metal persulfates, and mixtures thereof. 29. Composition according to Claim 28, characterized in that the peroxygen salt or salts are chosen from sodium persulfate, potassium persulfate and mixtures thereof. 30. Composition according to any one of the preceding claims, characterized in that the amount of peroxygenated salt (s) is in the range of 10 to 70% by weight, preferably 20 to 60%. by weight relative to the total weight of the composition. 31. Composition according to any one of the preceding claims, characterized in that the alkaline agent (s) and / or the precursor (s) of alkaline agents are chosen from silicates, phosphates, carbonates or hydroxides of alkali metals. or alkaline earth metals, ammonia, alkanolamines and their derivatives, ammonium salts, and mixtures thereof. 32. Composition according to Claim 31, characterized in that the alkaline agent (s) and / or the alkali metal precursor (s) are chosen from ammonium chloride, alkali metal or alkaline earth silicates, and carbonates. of alkali or alkaline earth metals, and mixtures thereof 33. Composition according to any one of the preceding claims, characterized in that the amount of alkaline agent (s) is in the range from 0.01 to 40% by weight, preferably from 0 to 40% by weight. , 1 to 30% by weight relative to the total weight of the composition. 34. Composition according to any one of claims 1 to 33, characterized in that it is anhydrous. 35. Composition according to any one of claims 1 to 34, characterized in that it comprises hydrogen peroxide. 36. Process for bleaching and simultaneous dyeing of keratin fibers, characterized in that a composition as defined in any one of Claims 1 to 34, in the form of paste or powder, is mixed with a solution hydrogen peroxide and the resulting mixture is applied to the keratinous fibers. 37. Multi-compartment device, characterized in that it contains at least two compositions, the mixture of which leads to a composition as defined in claim 35. 38. Device according to claim 37, wherein a first compartment contains a composition (A) comprising, in a medium suitable for dyeing, one or more cationic direct dyes as defined in any one of claims 1 to 10 22 and 24 to 26, a second compartment contains an anhydrous composition (B) comprising one or more peroxygenated salts as defined in any one of claims 1 and 27 to 29 and one or more alkaline agents and / or one or more precursors of Alkaline agents as defined in any one of claims 1, 31 and 32, and a third compartment contains an aqueous hydrogen peroxide composition (E). 39. Apparatus according to claim 37, wherein a first compartment contains an anhydrous composition (C) comprising one or more cationic direct dyes as defined in any one of claims 1 to 22 and 23 to 26, one or more salts peroxygen compounds as defined in any one of claims 1 and 27 to 29, and one or more alkaline agents and / or one or more alkali metal precursors as defined in any one of claims 1, 31 and 32. and a second compartment contains an aqueous composition (E) of hydrogen peroxide. 40. Device according to claim 37, wherein a first compartment contains an anhydrous composition (B) comprising one or more peroxygenated salts as defined in any one of claims 1 and 27 to 29, and one or more alkaline agents such as as defined in any one of claims 1, 31 and 32, and a second compartment contains a composition (D) comprising, in a medium suitable for dyeing, one or more cationic dyestuffs as defined in any one of the claims 1-22 and 24-26, and hydrogen peroxide. 41. Use for bleaching and simultaneous dyeing of a composition as defined in any one of claims 1 to 35.