JP2602079B2 - Aminium salt compound, diimonium salt compound and optical recording medium - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an infrared absorbing compound comprising an aminium salt compound or a diimonium salt compound and an optical recording medium using the same, and particularly to an optical disk or an optical card.
The present invention relates to an infrared absorbing compound that improves durability and light resistance in repeated reproduction, and an optical recording medium using the same.

2. Description of the Related Art In general, an optical disc and an optical card have small optically detectable (for example, about 1 μm) pits formed on a thin recording layer provided on a base, in spiral or circular and linear tracks. High density information can be stored in the form. In order to write information on such an optical disk or optical card, a laser focused on the surface of the laser sensitive layer is scanned, and only the surface irradiated with the laser beam forms pits. It is formed in the form of a linear track. The laser sensitive layer is
Optically detectable pits can be formed by absorbing energy. For example, in the heat mode recording method, the laser sensitive layer absorbs heat energy, and small pits (pits) can be formed at that location by evaporation or melting. In another heat mode recording method, a pit having a density difference that can be optically detected can be formed at that location by absorbing the irradiated laser energy.

Here, by using an organic dye thin film as the recording layer having a high reflectance, the optical contrast of the recording pit can be set high. For example, when a polymethine-based dye, azulene-based dye, cyanine-based dye, pyrylium-based dye, or the like having a large light absorption for laser light is used as the organic dye thin film, a light-absorbing reflective film exhibiting metallic luster (reflectance of 10 to 50%) Is obtained, and the optical recording medium is capable of laser recording and capable of reflection reading. In particular, when a semiconductor laser having an oscillation wavelength of 600 to 900 nm is used as a laser light source, there is an advantage that the size and cost of the device can be reduced. However, the organic dye thin film has a problem that the recording / reproducing characteristics and the storage stability are deteriorated due to the fact that the substance easily changes in response to heat and light.

[Problems to be Solved by the Invention] The present invention has been made in view of the prior art as described above, and an object of the present invention is to have a large absorption in an infrared region and to be able to easily synthesize. It is an object of the present invention to provide a novel infrared absorbing compound comprising a novel aminium salt compound or a diimonium salt compound.

Another object of the present invention is to provide an optical recording medium in which, when the novel infrared absorbing compound according to the present invention is used for an optical recording medium, the durability and light resistance in repeated reproduction are remarkably increased.

[Means for Solving the Problems] and [Operation] That is, the present invention provides the following general formula (I) or general formula (I
An aminium salt compound or a diimonium salt compound represented by I), and the following general formulas (I) and (II)
An optical recording medium comprising an organic dye thin film containing at least one of an aminium salt compound and a diimonium salt compound represented by the formula:

 In the general formulas (I) and (II), R₁~ R
₈Is an unsubstituted alkyl group having 1 to 8 carbon atoms or
A substituted alkoxy group, R₁And R_Two, R_ThreeAnd R_Four, R_FiveAnd R₆And
And R₇And R₈At least one of the combinations is with N
Unsubstituted or methyl-substituted 5-membered ring, unsubstituted
Or a 6-membered ring substituted with a methyl group or an unsubstituted 7-membered ring
Form a ring. Y₁~ Y₆Contains at least one nitrogen atom
To form an unsubstituted heterocycle. X Represents an anion.

R _{1 to} R ₈ are an alkyl group such as a methyl group,
Ethyl group, n-propyl group, iso-propyl group, n-butyl group, sec-butyl group, iso-butyl group, t-butyl group, n-amyl group, t-amyl group, n-hexyl group, n- And octyl and t-octyl. As the alkoxy group, for example,
It represents a methoxy group, an ethoxy group, a propoxy group, a butoxy group, and the like.

Further, R ₁ and R _2, R ₃ and R _4, R ₅ and pyrrolidine ring is as 5-membered ring at least one pair is formed with the N of the combinations of R ₆ and R ₇ and R _8, as the 6-membered ring Examples thereof include a piperidine ring, a morpholine ring, and a tetrahydropyridine ring, and these five- and six-membered rings may be substituted with a methyl group. Examples of the 7-membered ring include a cyclohexylamine ring. The combination of each substituent may be the same or different.

 X Means chloride ion, bromide ion, iodide ion
Perchlorate ion, nitrate ion, benzene sulfo
Phosphate ion, p-toluenesulfonate ion, methyl
Sulfate ion, ethyl sulfate ion, propyl sulfate
Ion, tetrafluoroborate ion, tetraphenylene
Ruborate ion, hexafluorophosphate ion,
Nzensulfinate ion, acetate ion, triflu
Oroacetate ion, propion acetate ion, benzoic acid
Salt ion, oxalate ion, succinate ion, malo
Phosphate ion, oleate ion, stearate ion
ON, citrate ion, monohydrogen diphosphate ion,
Hydrogen monophosphate ion, pentachlorostannate ion,
Chlorosulfonate ion, fluorosulfonate ion
Trifluoromethanesulfonate ion, hexaf
Fluoroarsenate ion, hexafluoroantimonate ion
ON, molybdate ion, tungstate ion
Negative ions such as iron, titanate and zirconate ions
Indicates ON.

Y ₁ of to Y _6, at least one nitrogen atom, Y ₁
Six atoms to Y ₆ form a heterocyclic ring. For example, And so on.

The method for producing the infrared absorbing compound of the present invention utilizes the methods described in U.S. Pat. No. 3,251,881, U.S. Pat. No. 3,587,871, U.S. Pat. No. 3,484,467 and JP-A-61-69991. Can be done. For example, it can be manufactured by the following process.

Where A is Is shown.

After alkylation of the amino compound obtained by the Ullmann reaction and the reduction reaction by selective substitution, a final product can be obtained by an oxidation reaction.

In this alkylation reaction, an alkylating agent suitable for obtaining a pyrrolidine ring, a piperidine ring, a morpholine ring, a tetrahydropyridine ring and the like may be used.

When R ₁ to R ₈ are asymmetric, it is necessary to carry out the alkylation or the like in multiple steps, and it is preferable that R ₁ to R ₈ are the same in terms of cost.

For example, to form a pyrrolidine ring as a 5-membered ring,
It can be formed by alkylation with 1,4-dibromobutane, 1,4-dichlorobutane, 1,4-diiodobutane and the like. To form a piperidine ring as a 6-membered ring, 1,5-dibromopentane, 1,5-dichloropentane,
Use 5-diiodopentane or the like. In the morpholine ring, hydroxyethylation is first performed with 2-bromoethanol or the like, followed by dehydration by acid treatment to form a morpholine ring, and the tetrahydropyridine ring is methacrylized by methacrylic bromide or the like and then cyclized by acid treatment. I can do it. In the cyclohexylamine ring, 1,6-
Cyclization is performed with dibromohexane or the like.

Next, specific examples of the infrared absorbing compound represented by the general formula (I) and the general formula (II) according to the present invention will be described. X For _{simplicity, (Y 1 Y 2 Y 3} Y 4 Y 5 Y 6), (R 1 R 2) (R 3 R 4) (R 5 R 6)
(R ₇ R ₈ ).

 For example, in the general formula (I), X Is ClO_Four , Y₁To Y₆But To form R₁To R₈Form a morpholine ring, Cl is
O_Four, (CCCCNC), (CH_TwoCH_TwoOCH_TwoCH_Two)₄Notation.

Compound No. (I) -1 ClO ₄ , (CCCCNC), (CH ₂ CH ₂ CH ₂ CH ₂ ) ₄ (I) -2 BF ₄ , (CCCCNC), (CH ₂ CH ₂ OCH ₂ CH ₂ ) ₄ (I) -4 AsF ₆ , (CCNCNC), (C ₃ H ₇ C ₃ H ₇ ) ₃ (CH ₂ CH ₂ CH ₂ ) (I) -5 SbF ₆ , (CNCNC), (CH ₂ CH = CHCH ₂ ) ₄ (I) -6 Br, (CNNCNN), (CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ ) _{4 (I) -9 ClO 4, (} CCCCNC), (CH = C (CH 3) CH 2 C (CH 3) 2 CH 2) 4 (I) -10 CF 3 SO 4, (CCNCNC), (CH 2 CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ ) ₄ (I) -11 SbF ₆ , (CNCCNC), (t-C ₄ H ₉ t-C ₄ H ₉ ) ₃ (CH ₂ CH ₂ = CH ₂ CH ₂ ) ( I) -12 ClO ₄ , (CCCCNC), (CH ₂ CH ₂ OCH ₂ CH ₂ ) ₄ Compound No. (II) -1 ClO ₄ , (CCCCNC), (CH ₂ CH ₂ CH ₂ CH ₂ ) ₄ (II) -2 ClO ₄ , (CCCCNC), (CH ₂ CH ₂ OCH ₂ CH ₂ ) ₄ (II) -4 Br, (CNCCNC), (C ₄ H ₉ C ₄ H ₉ ) ₃ (CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ ) (II) -5 AsF ₆ , (CNNCNN), (OCH ₃ OCH ₃ ) ₃ (CH ₂ CH ₂ CH ₂ CH ₂ ) (II) -6 SbF ₆ , (CCNCNC), (CH = C (CH ₃ ) CH ₂ C (CH ₃ ) ₂ CH ₂ ) ₄ (II) −7 I, (CCCCNC), (t−C ₄ H ₉ t−C ₄ H ₉ ) ₃ (CH ₂ CH ₂ OCH ₂ C
H ₂₎ (II) -9 ClO ₄ , (CCCCNC), (CH = C (CH ₃ ) CH ₂ C (CH ₃ ) ₂ CH ₃ ) ₄ (II) -10 ClO ₄ , (CNCCNC), (CH ₂ CH = CHCH ₂ ) ₄ (II) -11 NO ₃ , (CNCCNC), (CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ ) ₄ (II) -14 SbF ₆ , (CCNCNC), (CH ₂ CH = CHCH ₂ ) ₄ The infrared-absorbing compound composed of the aminium salt compound or diimonium salt compound exemplified above has a maximum absorption wavelength of 900 nm or more and absorbance. The coefficient also has a large absorption peak of about tens of thousands to hundreds of thousands.

Such an infrared absorbing compound is used for a heat insulating film, sunglasses and the like in addition to the use as a material of an optical recording medium.

Further, the infrared absorbing compound of the present invention can be used by being contained in an organic dye thin film of an optical recording medium.

As an optical recording medium, as a near-infrared absorbing dye forming an organic dye thin film used in combination with these infrared absorbing compounds,
Commonly known dyes are used, for example, cyanine dyes, merocyanine dyes, croconium dyes, squarium dyes, azurenium dyes, polymethine dyes, naphthoquinone dyes, pyrylium dyes, phthalocyanine dyes, and the like. is there.

The amount of the infrared absorbing compound comprising the aminium salt compound represented by the general formula (I) or the diimonium salt compound represented by the general formula (II) is 1 to 1 with respect to the recording layer based on the total solid content. 60% by weight, preferably 5 to 40% by weight, more preferably 10 to 30% by weight is suitable.

In addition to these compounds, a binder may be contained in the recording layer composed of the organic dye thin film. As the binder, for example, cellulose esters such as nitrocellulose, cellulose phosphate, cellulose sulfate, cellulose acetate, cellulose propionate, cellulose butyrate, cellulose myristate, cellulose palymate, cellulose acetate / propionate, cellulose acetate / butyrate, and methylcellulose , Ethyl cellulose, propyl cellulose, cellulose resins such as butyl cellulose, polystyrene, polyvinyl chloride, polyvinyl acetate, polyvinyl butyral, polyvinyl acetal, polyvinyl alcohol, polyvinyl resins such as polyvinyl pyrrolidone,
Copolymer resins such as styrene-butadiene copolymer, styrene-acrylonitrile copolymer, styrene-butadiene-acrylonitrile copolymer, vinyl chloride-vinyl acetate copolymer, polymethyl methacrylate,
Acrylic resins such as polymethyl acrylate, polybutyl acrylate, polyacrylic acid, polymethacrylic acid, polyacrylamide, polyacrylonitrile, polyesters such as polyethylene terephthalate, poly (4,4'-isopropylidene diphenylene-co-1, 4-cyclohexylene dimethylene carbonate), poly (ethylenedioxy-3,3'-phenylenethiocarbonate), poly (4,4'-isopropylidenediphenylenecarbonate-co-terephthalate), poly (4,4'- Isopropylidene diphenylene carbonate), poly (4,
Polyacrylate resins such as 4'-sec-butylidene diphenylene carbonate), poly (4,4'-isopropylidene diphenylene carbonate-block-oxyethylene), or polyamides, polyimides, epoxy resins, phenol resins And polyolefins such as polyethylene, polypropylene, and chlorinated polyethylene.

Also, a surfactant, an antistatic agent, a stabilizer,
A dispersible flame retardant, a lubricant, a plasticizer, and the like may be contained.

Further, an undercoat layer may be provided between the recording layer and the substrate, and a protective layer may be provided on the recording layer.

The undercoat layer is used to provide solvent resistance, improve reflectivity, or improve repetitive reproduction. The protective layer is used to protect against scratches, dust, dirt, etc., and to provide environmental stability to the recording layer. Can be The materials used for these are mainly inorganic compounds, metals or organic high molecular compounds. As the inorganic compound, for example, SiO ₂ , MgF ₂ , SiO,
Examples of metals such as TiO ₂ , ZnO, TiN, and SiN include, for example, Zn, Cu, N
i, Al, Cr, Ge, Se, Cd and the like, and as the organic polymer compound, an ionomer resin, a polyamide resin, a vinyl resin, a natural polymer, an epoxy resin, a silane coupling agent and the like can be used.

As the substrate, plastic such as polyester, polycarbonate, acrylic resin, polyolefin resin, phenol resin, epoxy resin, polyamide, and polyimide, glass, and metals can be used.

The organic solvent that can be used for coating differs depending on whether it is in a dispersed state or a dissolved state. Generally, alcohols such as methanol, ethanol, isopropanol and diacetone alcohol, and ketones such as acetone, methyl ethyl ketone and cyclohexanone are used. Kind, N, N
Amides such as dimethylformamide, N, N-dimethylacetamide, sulfoxides such as dimethylsulfoxide, ethers such as tetrahydrofuran, dioxane, ethylene glycol monomethyl ether, esters such as methyl acetate, ethyl acetate and butyl acetate, chloroform, Aliphatic halogenated hydrocarbons such as methylene chloride, dichloroethylene, carbon tetrachloride, and trichloroethylene; aromatics such as benzene, toluene, xylene, monochlorobenzene, and dichlorobenzene; and n-hexane and cyclohexanoligroin. Aliphatic hydrocarbons and the like can be used.

The coating can be performed by a coating method such as a dip coating method, a spray coating method, a spinner coating method, a bead coating method, a wire bar coating method, a blade coating method, a roller coating method, and a curtain coating method.

The film thickness of the recording layer formed using such a solvent is 50
Å to 100 μm, preferably 200 to 1 μm is suitable.

[Example] Next, an example in the present invention will be described.

Synthesis Example 1 15 parts of 1-amino-5-nitropyridine was dissolved in 120 parts of a 2N aqueous hydrochloric acid solution, and 14 parts of tin powder was added with stirring, followed by stirring for 2 hours. After the reaction, the mixture was poured into 600 parts of ice water, and the solution was neutralized with 2N aqueous NaOH to obtain 2,5-diaminopyridine as a target product.

0.1 mol of 2,5-diaminopyridine, 0.45 mol of p-nitroiodobenzene, 0.25 mol of anhydrous potassium carbonate, and 2 parts (by weight) of copper powder were refluxed in 120 parts of dimethylformamide with stirring for 4 days. After the reaction, the reaction mixture was passed, and the product was thoroughly washed with dimethylformamide, water and acetone, and then dried. 27 parts of red-brown tetrakis (p-nitrophenyl) -2,5-diaminopyridine were obtained.

25 parts of the compound obtained above were added to an autoclave together with 2 parts of 95 parts of dimethylformamide palladium-carbon hydrogenation catalyst, and hydrogen gas was applied at 5.0 kg / cm ² to 90 ° C to 100 ° C.
Stirred until hydrogen absorption ceased underneath.

After the reaction, the reaction solution was passed, and the product was washed with dimethylformamide. The solution was poured into 340 parts of ice water. After stirring for a while, the precipitate was collected. Recrystallization was performed with a mixed solvent of ethanol dimethylformamide to obtain 10 parts of tetrakis (p-aminophenyl) -2,5-diaminopyridine. When the purity was measured by high performance liquid chromatography,
The purity was 98.5%.

Synthesis of Compound No. I-3 3 parts of the above amino compound was treated with 18 parts of dimethylformamide, 0.5 part of anhydrous sodium hydrogencarbonate, and 2.5 parts of 2,5-dibromohexane.
The mixture was heated and stirred at 100 ° C to 130 ° C together with the parts. After reacting for 36 hours, the reaction solution was poured into ice water (100 parts) and extracted with ethyl acetate. After drying, it was purified on a silica gel column. Acquisition amount is 3.
Five copies. The disappearance of absorption due to NH stretching vibration of the amino group was confirmed by infrared absorption analysis.

One part of this compound was dispersed in 20 parts of acetone, and an equimolar amount of silver perchlorate was added with stirring. After reacting at room temperature for 1 hour, the precipitated silver was separated, and the solution was diluted with isopropyl ether and allowed to stand to collect precipitated crystals. The acquisition amount is
0.9 parts.

Compound No. I-3 thus synthesized was a compound having a large absorption region in the infrared region having an absorption maximum wavelength of 1119 nm and an absorption coefficient of 62,000.

Synthesis of Compound No. II-3 Pyrrolidine Form Obtained During Synthesis of Compound No. I-3
1.0 part was dispersed in 20 parts of acetone, and 2 moles of silver perchlorate was added with stirring. After reacting for 1 hour at room temperature,
The precipitated silver was separated, and the solution was diluted with isopropyl ether. 0.57 parts of precipitated crystals were collected.

The above-described example is a case where the anion is perchloric acid. However, in the case where another anion is used, a target compound can be easily obtained by using a silver salt corresponding thereto. For example, AgSbF ₆ , AgBF ₄ , AgSO ₄ , AgNO ₃ , AgSO ₃ C ₆ H ₄
Silver salts such as CH ₃ and AgSO ₃ CF ₃ can be used. Also,
In addition, it can also be obtained by electrolytic oxidation.

Synthesis Example 2 A reaction was performed in the same manner as in Synthesis Example 1 except that 2-amino-5-nitropyridine used in Synthesis Example 1 was changed to 2-amino-5-nitropyrimidine, and tetrakis (p-
23 parts of (aminophenyl) -2,5-diaminopyrimidine were obtained.

Synthesis of Compound No. I-5 3 parts of the amino compound obtained in Synthesis Example 2 was converted to dimethylformamide
18 parts, 0.6 parts of anhydrous sodium hydrogencarbonate, and 4.0 parts of 1,4-dibromobutene were heated and stirred at 100 ° C to 130 ° C. 36
After the reaction, the reaction solution was poured into 130 parts of ice water and extracted with ethyl acetate. After drying, it was purified on a silica gel column. The amount obtained was 3.5 copies. Amino group NH by infrared absorption analysis
The disappearance of absorption due to stretching vibration was confirmed.

One part of this compound was dispersed in 20 parts of acetone, and an equimolar amount of silver hexafluoroantimonate was added with stirring. After reacting at room temperature for 1 hour, the precipitated silver was separated, and the solution was diluted with isopropyl ether and allowed to stand to collect precipitated crystals. The amount obtained was 0.8 parts. The maximum absorption wavelength is 110
It was 9 nm.

Synthesis of Compound No. II-14 Pyroline derivative obtained in the course of synthesis of Compound No. I-5 1.
0 parts was dispersed in 40 parts of acetone, and 2 moles of silver perchlorate was added at room temperature while stirring with stirring, and the mixture was stirred for 1 hour. After the reaction, the precipitated silver salt was separated and washed well with acetone. After acetone was distilled off from the solution, the solution was washed with water and dried under reduced pressure. The obtained amount was 0.60 part, and the compound was an infrared absorbing compound having a maximum peak at 1060 nm.

Next, examples using the infrared absorbing compounds represented by the general formulas (I) and (II) as optical recording materials will be described.

Example 1 A 50 μm pre-group was provided on a polymethyl methacrylate (hereinafter referred to as PMMA) substrate having a diameter of 130 mmφ and a thickness of 1.2 mm, and an organic dye of a polymethine dye (Nippon Kayaku IR-820) was formed thereon. Infrared absorbing compound No. I-3 at a weight ratio of 90:10
The liquid dissolved in 1,2-dichloroethane was spin-coated to form a recording layer of 800 °. An optical recording medium having an air sandwich structure was obtained by sandwiching a 0.3 mm spacer on the inner and outer peripheral sides of the medium thus obtained and bonding the medium to another PMMA substrate with an ultraviolet-curable resin adhesive.

This was rotated to 1800 rpm, and using a semiconductor laser having a wavelength of 830 nm, a recording power of 6 mW and a recording frequency of 3 MHz were applied from the substrate side.
I wrote with z. Next, reproduction was performed at a read power of 0.8 mW, and the C / N ratio was measured by spectral analysis. Subsequently, C / after reading 100,000 times (playback repeated)
The N ratio was measured.

Further, the optical recording medium prepared under the above conditions was irradiated with a 1 KW / m ² xenon lamp for 100 hours to perform a light stability test, and the reflectance and the C / N ratio were measured. The results are shown in Table 1.

Example 2 1-guaiazulenyl-5- (6'-t-butylazulenyl) -2,4-pentadienol perchlorate and the infrared ray were formed on the same substrate as in Example 1 in the same manner as in Example 1. The recording layer was provided with a solution of absorbing compound No. I-14 at a weight ratio of 90:10.

The same test as in Example 1 was performed on the optical recording medium thus obtained. Table 2 shows the results.

Examples 3 to 8 An optical recording medium having the composition shown in Table 3 was prepared in the same manner as in Example 1, and the same test as in Example 1 was performed. Table-Results
It is shown in FIG.

Comparative Examples 1 to 3 Optical recording media were prepared and evaluated in the same manner as in Examples 1, 2 and 5 except that the infrared absorbing compounds used in Examples 1, 2 and 5 were omitted. The results are shown in Table-4.

Examples 9 to 12 A pre-group was formed on a wallet-sized 0.4 mm-thick polycarbonate (hereinafter abbreviated as "PC") substrate by a hot press method, and an organic dye and red shown in Table 5 below were provided thereon. A liquid in which the external absorption compound was mixed in diacetone alcohol was applied by a bar coating method, and then dried to obtain a 850 ° recording layer. Further, ethylene-
Wallet-sized thickness through the vinegar bidry film
An optical recording medium having a close contact structure was produced by bonding a 0.3 mm PC substrate by a hot roll method.

The optical recording medium of each example manufactured in this manner was mounted on a stage driven in the X and Y directions, and the recording power was applied to the organic thin film recording layer from the 0.4 mm-thick PC substrate side using a semiconductor laser having an oscillation wavelength of 830 nm. 4.0mW, recording pulse 80μsec, Y
Writes information in the axial direction, reproduces it with a read power of 0.4 mW, and its contrast ratio Was measured.

Further, the same optical recording medium manufactured under the above conditions was subjected to a light resistance stability test under the same conditions as in Example 1, and thereafter, the reflectance and the contrast ratio were measured. Table 6 shows the results.
Shown in

Comparative Examples 5 and 6 Optical recording media were prepared and evaluated in the same manner as in Examples 9 and 11, except that the infrared absorbing compound was omitted in Examples 9 and 11. The results are shown in Table-6.

[Effects of the Invention] As described above, the aminium salt compounds and diimonium salt compounds represented by the general formulas (I) and (II) of the present invention have large absorption in the infrared region and can be easily synthesized. be able to.

When the aminium salt compound and / or diimonium salt compound is contained in an organic dye thin film and used as an optical recording medium, it is possible to obtain an optical recording medium having remarkably increased durability and light resistance in repeated reproduction. Became possible.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location C07D 257/08 C09B 57/00 Z C09B 57/00 C09K 3/00 105 C09K 3/00 105 8721-5D G11B 7 / 24 516 G11B 7/24 516 B41M 5/26 Y (72) Inventor Tetsuro Fukui 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (56) References JP-A-2-134366 (JP, A)

Claims (2)

(57) [Claims] 1. A compound represented by the following general formula (I) or (II)
Aminium salt compound or diimonium chloride compound
Stuff. (Where R₁~ R₈Is an unsubstituted alkyl having 1 to 8 carbon atoms
Or an unsubstituted alkoxy group, R₁And R_Two, R_ThreeAnd R
_Four, R_FiveAnd R₆And R₇And R₈At least one of the combinations
Is unsubstituted with N or substituted with a methyl group.
A ring, a 6-membered ring unsubstituted or substituted with a methyl group, or
Forms an unsubstituted 7-membered ring. Y₁~ Y₆Is at least one
Forms an unsubstituted heterocycle containing a nitrogen atom. X Is shade
Indicates ON. ) 2. A compound represented by the following general formulas (I) and (II)
Salt compounds and diimonium salt compounds
Having an organic dye thin film containing at least one of
An optical recording medium characterized by the above-mentioned. (Where R₁~ R₈Is an unsubstituted alkyl having 1 to 8 carbon atoms
Or an unsubstituted alkoxy group, R₁And R_Two, R_ThreeAnd R
_Four, R_FiveAnd R₆And R₇And R₈At least one of the combinations
Is unsubstituted with N or substituted with a methyl group.
A ring, a 6-membered ring unsubstituted or substituted with a methyl group, or
Forms an unsubstituted 7-membered ring. Y₁~ Y₆Is at least one
Forms an unsubstituted heterocycle containing a nitrogen atom. X Is shade
Indicates ON. )