JPH1158961A - Optical information recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an optical information recording medium, in which a semiconductor laser, the oscillation wavelength of which lies in short wavelength range, is employed and which is suitable for a high density recording. SOLUTION: In an optical recording medium, in which a recording layer is provided on a support, the recording layer includes at least one kind of a compound represented by a formula, in which R1 and R2 represent respectively and independently a substituted or unsubstituted alkyl group, a substituted or unsubstituted alkenyl group or the like. R3 , R4 , R5 and R6 represent respectively and independently hydrogen, halogen, a substituted or unsubstituted alkyl group or the like or R3 and R4 or R5 and R6 may well be formed together into a condensed aryl group. Y represents a connecting group. X represents an organic or an inorganic anion. (n) represents either 1 or 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording medium, and more particularly to a writable write-once optical information recording medium having a recording film containing an organic dye.

[0002]

2. Description of the Related Art Optical information recording media have come to be widely used because of their excellent characteristics, such as generally having a large storage capacity and recording / reproducing without contact.
In the current write-once type (WORM, CD-R) optical disk, laser is focused on a very small area of the recording film, recording is performed by changing the properties of the recording film, and reproduction is performed based on the difference in the amount of reflected light from the unrecorded portion. I have to.

It is generally well known that an organic dye is used for a recording film of this write-once optical recording medium. In order to smoothly change the properties of the recording film, the medium generally has a so-called air sandwich structure in which two recording media are provided on a substrate and the recording films are arranged to face each other. It is.

[0004]

However, with an increase in the amount of information in the future, attempts have been made to shorten the wavelength of a semiconductor laser from the current one and perform high-density recording. A cyanine dye conventionally used in a write-once optical recording medium has a wavelength of 6 nm, which is a laser used for high-density recording.
In the vicinity of 35 to 650 nm, there is a problem that sufficient sensitivity is not obtained due to lack of sufficient reflectance and absorption. The present invention has been made in view of such circumstances, and an object of the present invention is to provide an optical information recording medium suitable for high-density recording using a semiconductor laser having an oscillation wavelength at a short wavelength. .

[0005]

Means for Solving the Problems As a result of intensive efforts to solve the above-mentioned problems, the present inventors have found that an optical recording medium in which a recording layer is provided directly or via an undercoat layer on a substrate is used for recording. The inventors have found that an optical information recording medium characterized by including at least one compound represented by the following formula (1) in a layer is provided, and completed the present invention. That is, the present invention provides (1) an optical recording medium having a recording layer provided directly or via an undercoat layer on a substrate, wherein the recording layer has the following formula (1)

[0006]

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(In the formula (1), R ₁ and R ₂ each independently represent a substituted or unsubstituted alkyl group or a substituted or unsubstituted alkenyl group, and R ₃ , R ₄ ,
R ₅ and R ₆ each independently represent a hydrogen atom, a halogen atom,
Represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, an acyl group or an alkoxy group, or R ₃ and R ₄ or R ₅ and R ₆ may together form a condensed aryl group . Y represents a linking group, and X represents an organic or inorganic anion. n represents either 1 or 2. An optical information recording medium comprising at least one compound represented by the formula (1): (2) R ₃ ,
R ₄ , R ₅ and R ₆ are each independently a hydrogen atom, a halogen atom or an alkyl group having 1 to 4 carbon atoms, or a condensed aryl group wherein R ₃ and R ₄ or R ₅ and R ₆ are combined (3) the optical information recording medium according to (1), wherein Y is a linking group which may contain a chalcogen atom having 1 to 8 carbon atoms; (4) R ₃ And R ₄ , and R ₅ and R ₆ are the same substituents. (1) wherein (5) R ₁ and R ₂ are each independently substituted or unsubstituted 1 to 9 carbon atoms; The optical information recording medium according to (1), which is an alkyl group; (6) the optical information recording medium according to (1), wherein Y is an alkylene group optionally having an ether bond; It is characterized in that at least one compound according to any one of (6) and a singlet oxygen quencher are supported. It optical information recording medium, the maximum absorption wavelength in (8) the recording layer 670 not to 740
(1) characterized by mixing an organic dye in the nm range
(9) The optical information recording medium according to (8), wherein the organic dye is at least one of a pentamethine cyanine dye, a phthalocyanine dye, and an azo metal chelate dye. 10) An optical information recording medium in which a metal reflective layer and a protective layer are provided on a recording layer, wherein the metal reflective layer contains any one of gold, silver and aluminum as a main component, and the protective layer is an ultraviolet curable type. The optical information recording medium according to any one of (1) to (9), comprising a resin.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION R ₁ , R ₂ ,
In R ₃ , R ₄ , R ₅ and R ₆ , examples of the unsubstituted alkyl group include a methyl group, an ethyl group, a propyl group, an isopropyl group, a 2-methylpropyl group, a butyl group and a t-butyl group. And a C1-C18 alkyl group such as a group, pentyl group, hexyl group, dodecyl group and octadecyl group, and preferably a C1-C8 alkyl group. Examples of the substituent of the substituted alkyl group include an alkyloxy group, a halogen atom, an alkyloxyalkyloxy group, an aryl group, and a hydroxyl group. Specific examples of the substituted alkyl group include a hydroxymethyl group, a methoxyethyl group, and ethoxyethyl. Group, butoxyethyl group, phenylethyl group, phenylpropyl group, benzyl group, tetrafluoropropyl group, trifluoroethyl group, methoxyethyloxyethyl group, methoxypropyl group, hydroxypropyl group, furfuryl group, acetyloxyethyl group, phenyl A C1-C9 substituted alkyl group such as an oxyethyl group is preferred, and a C1-C8 substituted alkyl group is preferred. Examples of the substituted or unsubstituted alkenyl group in R ₁ and R ₂ include C3-C9 alkenyl groups such as an allyl group, a butenyl group and a cinnamyl group. R
_{As the} halogen atom in ₃ , R ₄ , R ₅ and R ₆ ,
A fluorine atom, a chlorine atom, a bromine atom, an iodine atom and the like can be mentioned, but a chlorine atom and a fluorine atom are preferable, and the substituted or unsubstituted aryl group includes a phenyl group, a 4-chlorophenyl group, a 4-methylphenyl group and the like. C6-C7
An aryl group; an acyl group includes a benzoyl group, a furyl group and an acetyl group; and an alkoxy group includes a C1-C4 alkoxy group such as a methoxy group, an ethoxy group, a propyloxy group, and a butoxy group. Examples of the aryl group include a condensed phenyl group. m is preferably from 1 to 2. Examples of the chalcogen atom for Y include an oxygen atom and a sulfur atom. Examples of the linking group Y include a methylene group, an ethylene group, and n-
Propylene group, i-propylene group, n-butylene group, i
-Butylene group, t-butylene group, ortho-xylylene group,
Xylylene group, -CH ₂ CH including m-xylylene group and a chalcogen atom _{2 OCH 2 CH 2 -, -} CH 2 C
H ₂ OCH ₂ CH ₂ OCH ₂ CH ₂ — and the like.

Examples of the anion X include an organic acid anion such as an organic carboxylic acid and an organic sulfonic acid, an inorganic anion such as a halogen ion, and a transition metal complex anion. Specific examples of the organic acid anion include acetate ion, methanesulfonic acid ion, tetraphenylborate ion, butyltriphenylborate ion, toluenesulfonic acid ion, 1,5-naphthalenedisulfonic acid ion, 2,6-
Naphthalene mono or disulfonic acid ions such as naphthalene disulfonic acid ion, R acid ion, G acid ion, lactate ion, p-chlorobenzenesulfonic acid ion, nitrobenzenesulfonic acid ion, dodecylbenzenesulfonic acid ion, benzenesulfonic acid ion, ethanesulfonic acid Ion, trifluoroacetate ion, propionate ion, benzoate ion, oxalate ion, succinate ion, stearate ion, trifluoromethanesulfonate ion and the like, preferably trifluoromethanesulfonate ion, toluenesulfonate ion And alkyl or aryl sulfonic acids such as As the transition metal complex anion, a Ni complex of a benzenedithiol derivative, a Ni complex of a naphthalenedithiol derivative,
Ni complexes of ethenedithiol derivatives and the like can be mentioned. Specific examples of the inorganic anion include chloride ion, bromide ion, fluorine ion, thiocyanate ion, iodine ion, hexamonate antimonate ion, perchlorate ion, periodate ion, nitrate ion, and tetrafluoroborate. Ion, hexafluorophosphate ion, molybdate ion, tungstate ion, titanate ion, vanadate ion, phosphate ion, borate ion, and the like.
Preferred are ions having a relatively large molecular weight such as perchlorate ion, iodine ion, tetrafluoroborate ion, hexafluorophosphate ion and hexafluoroantimonate ion.

[0010] Specific examples of the compound represented by the general formula (1) in the present invention are shown in Table 1, but are not limited thereto. In Table 1, 1,5-NpS represents 1,5-naphthalenedisulfonic acid ion, TsO represents toluenesulfonic acid ion, and Ph represents a phenyl group.

Compound NO. 5 CH3 CH3 HHHH -C2H4OC2H4- 2I- 6 CH3 CH3 HHHH -C2H4OC2H4- 2TsO- 7 CH3OCH2CH2 CH3OCH2CH2 HHHH -C2H4OC2H4- 1,5-NpS- 8 CH3 CH3 HHHH -C2H3 -2ClO4-HCl 10 CH3 CH3 HH Cl H -C2H4- 2SbF6-

[0012] 11 CH3 CH3 Cl H Cl H -C2H4- 2BF4- 12 CH3OCH2CH2 CH3OCH2CH2 HHHH -C2H4- 2I- 13 CH3OCH2CH2 CH3OCH2CH2 HHHH -C2H4- 2TsO- 14 CH3OCH2CH2 CH3OCH2CH2 CH H4-H2N2 HHHH -C3H6- (n) 2ClO4- 16 CH3 CH3 HHHH -C3H6- (n) 2PF6- 17 CH3CH2 CH3CH2- Condensed Ph Condensed Ph -C3H6- (n) 2SbF6- 18 CH3OCH2CH2 CH3OCH2CH2 HH Condensed Ph -C3H6- (i) 2BF -19 CH3CH2OCH2CH2 CH3CH2OCH2CH2 HHHH -C3H6- (n) 2I-20 CH3 CH3 HHHH -C3H6- (n) 2TsO- 21 CH3 CH3 HHHH -C3H6- (n) 1,5-NaS2- 22 CH3 CH3 HHHHH -C4H8- (n ) 2ClO4- 23 CH3 CH3 HHHH -C4H8- (n) 2PF64- 24 CH3 CH3 HHHH -C4H8- (n) 2SbF6- 25 CH3 CH3 HHHH -C4H8- (n) 2BF4- 26 CH3 CH3 HH Condensed Ph -C4H8- (n ) 2I- 27 CH3 CH3 HH Condensed Ph -C4H8- (n) 2TsO- 28 CH3 CH3 HH Cl H -C4H8- (n) 1,5-NaS2- 29 CH3 CH3 HHHH -C2H4OC2H4OC2H4- 2ClO4- 30 CH3CF2CF2 CH3CF2CF2 HH Cl H -C2H4OC2H4OC2H4- 2PF6- 31 CH3OCH2CH2 CH3OCH2CH2 HHHH -C2H4OC2H4OC2H4- 2SbF6- 32 CH3CH2OCH2CH2 CH3CH2OCH2CH2 HHHH -C2H4OC2H4OC2H4- 2BF4- 33 PhOCH2CH2 HHH -C2H4OC2H4OC2H4- 2BF4- 34 PhCH2 PhCH2 HHHH -C2H4OC2H4OC2H4- 2TsO- 35 PhCH2 PhCH2 HHHH -C2H4OC2H4OC2H4- R acid ion 36 CH3 CH3 HHHH p-Xylilene 2Cl3H3 CH3 CH3H3 HHHH p-Xylilene group 2SbF6- 39 PhCH2 PhCH2 HHHH p-Xylilene group 2BF4- 40 PhCH2CH2 PhCH2CH2 HHHH p-Xylilene group 2I-

[0013] 41 PhCH2CH2CH2 PhCH2CH2CH2 HHHH p-Xylilene group 2TsO- 42 PhOCH2CH2 PhOCH2CH2 HHHH p-Xylilene group R acid ion 43 CH3 CH3 HHHHo-Xylilene group 2ClO4- 44 CH3CF2CF2 CH3CF2CF2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H2H3 Xylilene group 2SbF6- 46 PhCH2CH2 PhCH2CH2 HHHH o-Xylilene group 2BF4- 47 PhOCH2CH2CH2 PhOCH2CH2CH2 HHHH o-Xylilene group 2I- 48 CH3OCH2CH2 CH3OCH2CH2 HHHH o-Xylilene group 2TsO- 49 BuOCH2CH2 BuOCH2CH2 HHHH o-Xylilene group R ion 50 CH3 CH3 condensation Ph HH -C2H4OC2H4- 2ClO4- 51 CH3 CH3 Condensed Ph HH -C2H4OC2H4- 2TsO- 52 CH3 CH3 Condensed Ph HH -C2H4OC2H4- 2BF4- 53 CH3 CH3 Condensed Ph HH -C2H4OC2H4- R acid ion 54 CH3 CH3 Condensed PhH2 -55 CH3 CH3 Condensed Ph HH -C3H6- (n) 2I- 56 CH3 CH3 Condensed Ph HH -C3H6- (n) 2ClO4- 57 CH3 CH3 Condensed Ph HH -C4H8- (n) 2SbF6- 58 CH3 CH3 Condensed Ph HH- C4H8- (t) 2ClO4- 59 CH3 CH3 Condensed Ph HH -C2H4OC2H4OC2H4- 2BF4- 60 CH3 CH3 Condensed Ph HH o-Xylilene group 2TsO- 61 CH3 CH3 Condensed Ph HH p-Xylilene group 1,5- NaS2- 62 CH3 CH3 HH Condensed Ph -C2H4OC2H4OC2H4- 2ClO4- 63 CH3 CH3 Cl H Cl H -C2H4OC2H4- 2ClO4- 64 CH3 CH3 Cl HHH -C2H4- 2SbF6- 65 CH3 CH3 Cl HHH -C3H6- (n) 1,5- NpS- 66 C2H5 C2H5 Cl H Cl H o-Xylilene group 2I- 67 C3H7 C3H7 Cl H CH3 H -C2H4OC2H4- 2Cl- 68 C3H6OH C3H6OH Br H Ph H -C2H4- 2C2H4SO4- 69 C2H4OAc C2H4OAc ClC2C -

70 C2H5 C2H5 Condensed Ph Cl Cl -C2H4- 2SbF6- 71 CH3 CH3 Condensed Ph Condensed Ph -C2H4OC2H4- 2ClO4- 72 CH3 CH3 Condensed Ph Condensed Ph -C2H4OC2H4- 2BF4- 73 CH3 CH3 Condensed Ph Condensed Ph -C2H4 -74 CH3 CH3 Condensed Ph Condensed Ph -C2H4OC2H4- 2TsO- 75 CH3 CH3 HH Cl H -C2H4OC2H4- 2ClO4- 76 CH3 CH3 HH Cl H -C2H4OC2H4- 2PF6- 78 CH3 CH3 HH Cl H -C2H4OC2H4- 2TsO-

The compound represented by the general formula (1) of the present invention is represented by the formula (2)

[0016]

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A tribase aldehyde derivative represented by the formula (3)

[0018]

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The bisindolenine derivative represented by the formula (I) is reacted in a solvent, preferably in acetic acid or in acetic anhydride or in a mixed solvent of both, at 0 to 80 ° C, preferably at 5 ° C.
It is obtained by performing a condensation reaction in the presence of a strong acid such as perchloric acid, borofluoric acid and p-toluenesulfonic acid at -30 ° C. When exchanging counter ions, add
The corresponding acid or salt thereof can be dissolved in a solvent capable of dissolving the same, preferably acetic anhydride or acetic acid, or the dye once removed can be dissolved in a water-soluble solvent such as alcohol, DMF, acetic acid or the like and water. It can be synthesized by a method of dissolving in a mixed solvent, adding an acid or salt of a desired anion and performing salt exchange.

The compounds used in the optical recording medium of the present invention may be used alone or in combination of two or more kinds. Dyes other than the compounds used in the present invention, for example, dyes having different absorption wavelengths, preferably It may be used in combination with an organic dye having a maximum absorption wavelength of 670 to 740 nm.
Examples of such dyes include pentamethine cyanine dyes, squarylium dyes, indoaniline dyes, phthalocyanine dyes, azo dyes, and more preferably pentamethine cyanine dyes, phthalocyanine dyes, and azo metal chelate dyes. Is also good. In addition, various antioxidants, ultraviolet absorbers, and singlet oxygen quencher may be used in combination for improving reading durability and light resistance. Examples of the singlet oxygen quencher include transition metal complexes such as common nickel complexes and copper complexes, nitroso compounds of diphenylamine, aminium-based and diimonium-based compounds (for example, IRG-002, IRG-
022, IRG-023, etc.), and various resins may be used in combination. In the present invention, a conjugate of the cation of the compound represented by the general formula (1) and the anion of the quencher can also be used. The quencher is generally used in an amount of 0.01 to 10 mol, preferably 0.03 to 2.0 mol, per 1 mol of the compound of the formula (1).

The optical information recording medium of the present invention comprises a substrate and a recording layer containing the compound represented by the general formula (1), and if necessary, a reflective layer and a protective layer are provided. Any known substrate can be used as the substrate. For example, glass, a metal plate, or a plastic can be used, and examples of the plastic include an acrylic resin, a polycarbonate resin, a methacrylic resin, a polysulfone resin, a polyimide resin, an amorphous polyolefin resin, a polyester resin, and a polypropylene resin. Examples of the shape of the substrate include various shapes such as a disk shape, a card shape, a sheet shape, and a roll film shape.

A guide groove may be formed on a glass or plastic substrate to facilitate tracking during recording. A glass or plastic substrate may be provided with an undercoat layer such as a plastic binder or an inorganic oxide or an inorganic sulfide. The undercoat layer preferably has a lower thermal conductivity than the substrate.

The recording layer in the present invention is formed, for example, of a compound represented by the general formula (1) and, if necessary, a quencher by a known organic solvent such as tetrafluoropropanol, diacetone alcohol, methanol, ethanol or butanol. Dissolved in methyl cellosolve, ethyl cellosolve, dichloroethane, isophorone, cyclohexanone, etc., if necessary, by adding an appropriate binder, and applying the solution on a substrate by a spin coater, bar coater, roll rotor, or the like. Can be done. Other methods include a vacuum deposition method, a sputtering method, a doctor blade method, a casting method, and a dipping method in which a substrate is immersed in a solution.

The thickness of the recording layer is 0.01 μm to 5 μm,
Preferably, it is 0.02 μm to 3 μm. If this value is less than 0.01 μm, recording sensitivity and reflectivity may be insufficient, and ideal recording may not be performed. on the other hand,
If this value exceeds 7 μm, there may be a disadvantage that recording sensitivity is insufficient.

The optical recording medium of the present invention can be provided with an undercoat layer on the substrate, a protective layer on the recording layer, and a reflective layer on the substrate or the recording layer, if necessary. When a reflective layer is provided, the reflective layer is made of gold, silver, copper, aluminum, or the like, preferably gold, silver, or aluminum metal, and is formed by vacuum deposition, sputtering, ion plating, or the like. Is done. The thickness of such a reflective layer is between 0.02 μm and 2 μm. The protective layer that may be provided on the reflective layer is generally coated with an ultraviolet curable resin by spin coating, and then irradiated with ultraviolet light.
It is formed by curing a coating film. In addition, an epoxy resin, an acrylic resin, a silicone resin, a urethane resin, or the like is also used as a material for forming the protective film. The thickness of such a protective film is usually 0.01 μm to 100 μm.

The optical recording medium of the present invention is preferably a DVD
Used for -R. In recording information or forming an image, a laser, for example, a condensed spot-like high energy beam such as a semiconductor laser, a helium-neon laser, a He-Cd laser, a YAG laser, and an Ar laser is passed through the substrate or the substrate. The information or image is read out by irradiating the recording layer from the opposite side, and the difference in the amount of reflected light or transmitted light between the pit portion and the portion where no pit is formed by irradiating a low-power laser beam. This is performed by detecting

[0027]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. In the examples, parts are by weight unless otherwise specified. Synthesis Example 1 15.9 parts of trimethylindolenine and diethylene glycol-di (p-toluenesulfonate) 2 in 5 parts of water
0.5 parts was added, and 3.45 parts of potassium carbonate was further added, followed by stirring at 110 ° C. for 3 hours. Thereafter, the mixture was cooled to room temperature, and the aqueous phase was separated to obtain cyanine. To a solvent of 0.08 part of acetic anhydride was added 5.81 parts of tribase aldehyde, and 3.80 parts of the above-obtained cyanine was added. After stirring at room temperature for several minutes, 21.6 parts of acetic anhydride was added. A solution to which 4.84 parts of 60% perchloric acid is added while cooling is added while stirring, and the mixture is stirred at room temperature. Thereafter, 4000 parts of water was added, and the mixture was stirred at room temperature overnight, filtered, washed with 500 parts of water, and dried to obtain a dark red crystal of Compound Example (1). λmax 548nm (methanol) Decomposition temperature 230 ℃
(TG-DTA)

Other examples of compounds are also described in Synthesis Example 1 above.
The corresponding tribase aldehyde derivative is synthesized in the same manner as described above, and the corresponding bis-indolenine derivative is allowed to react with the tribasic aldehyde derivative.

Example 1 (Example of recording medium) Compound 0.0 of compound example (1) obtained in Synthesis Example 1 above
Eight parts were dissolved in 4 parts of tetrafluoropropanol to obtain a coating solution. 2 ml of this solution was dropped on a 5-inch grooved polycarbonate resin substrate with a pipette, applied with a spin coater, and dried at 50 ° C. for 5 minutes to form a recording layer. The maximum absorption wavelength of the coating film was 566 nm. When the obtained coating film was irradiated with a semiconductor laser beam having a center wavelength of 635 nm at an output of 7 mW, pits with clear contours were formed. Further, while the coated substrate was rotated at 3.8 m / s, the substrate was irradiated with a semiconductor laser beam having a center wavelength of 635 nm at a recording frequency of 1 MHz and evaluated. As a result, a C / N ratio of 57 db was obtained. The storage stability of this coating film is 60 ° C x 8
It was good for 25 days or more under the condition of 0% RH.

[0030]

The optical information recording medium of the present invention has a structure in which a specific recording film containing a compound having a specific structure is provided on a substrate. It has sufficient sensitivity and reflectance for DVD-R using light, and is suitably used for high-density recording capable of recording and reproduction. In addition, by using an organic dye having a maximum absorption wavelength of 670 to 740 nm, a conventional semiconductor laser (around 780 nm wavelength)
And recording / reproduction at two wavelengths of short wavelength laser, ie DVD-
It can be used for both R and CD-R.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C07D 209/60 C07D 209/60

Claims (10)

[Claims] In an optical recording medium having a recording layer provided on a substrate directly or via an undercoat layer, the following formula (1) is embedded in the recording layer. (In the formula (1), R ₁ and R ₂ each independently represent a substituted or unsubstituted alkyl group or a substituted or unsubstituted alkenyl group, and R ₃ , R ₄ , R ₅ , and R ₆ each independently represent hydrogen. Atom, halogen atom, substituted or unsubstituted alkyl group, substituted or unsubstituted aryl group, acyl group or alkoxy group, or R ₃ and R ₄
Alternatively, R ₅ and R ₆ may together form a condensed aryl group. Y represents a linking group, and X represents an organic or inorganic anion. n represents either 1 or 2. An optical information recording medium comprising at least one compound represented by the formula (1): 2. R ₃ , R ₄ , R ₅ and R ₆ are each independently a hydrogen atom, a halogen atom or an alkyl group having 1 to 4 carbon atoms, or R ₃ and R ₄ or R ₅ and R ₆ The optical information recording medium according to claim 1, wherein is a fused aryl group taken together. 3. The optical information recording medium according to claim 1, wherein Y is a linking group which may contain a chalcogen atom having 1 to 8 carbon atoms. 4. The optical information recording medium according to claim 1, wherein R ₃ and R ₄ and R ₅ and R ₆ are the same substituent. 5. R ₁ and R ₂ each independently have 1 to 9 carbon atoms.
The optical information recording medium according to claim 1, which is a substituted or unsubstituted alkyl group. 6. The optical information recording medium according to claim 1, wherein Y is an alkylene group which may have an ether bond. 7. An optical information recording medium comprising at least one compound according to any one of claims 1 to 6 and a singlet oxygen quencher. 8. The recording layer having a maximum absorption wavelength of 670 to 74.
The optical information recording medium according to claim 1, wherein an organic dye having a wavelength of 0 nm is mixed. 9. A cyanine dye wherein the organic dye is pentamethine,
9. The optical information recording medium according to claim 8, wherein the optical information recording medium is at least one of a phthalocyanine dye and an azo metal chelate dye. 10. An optical information recording medium provided with a metal reflective layer and a protective layer on a recording layer, wherein the metal reflective layer contains any one of gold, silver and aluminum as a main component, and the protective layer is The optical information recording medium according to any one of claims 1 to 9, comprising an ultraviolet curable resin.