JP2822101B2 - Triarylamine compound and optical recording medium using the same - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a triarylamine compound and an optical recording medium using the same, and more particularly to an optical card or optical disk with improved durability and light resistance in repeated reproduction. The present invention relates to a triarylamine compound 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.

To solve such a problem, JP-A-60-236131, JP-A-60-259498, JP-A-62-30088, JP-A-62-32132, and JP-A-63-74689 have already been described. No.
JP-A-63-226642, JP-A-1-31693, JP-A-1-38490, JP-A-1-113482, etc.
A method has been proposed in which an organic dye thin film contains an aminium salt or a diimmonium salt of a triarylamine compound.

[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 provide a novel infrared absorbing compound having good solvent solubility and a novel infrared absorbing compound. An object of the present invention is to provide an optical recording medium having significantly increased light resistance and repeated reproduction durability.

[Means for Solving the Problems] That is, the present invention provides a triarylamine-based compound represented by the following general formula [I] or [II] and an organic dye thin film comprising the following general formula [I] or [II] ] An optical recording medium comprising a triarylamine compound represented by the formula:

_{(Wherein, R 1, R 2, R} 3, R 4, R 5, R 6, R 7, and R ₈ is a hydrogen atom, .R ₁ represents a halogen atom or a monovalent organic residue,
R ₂ , R ₃ , R ₄ , R ₅ , R ₆ , R ₇ , and R ₈ may each be different or the same. Also, R ₁ and R ₂ , R ₃ and R ₄ , R ₅
R ₆ , or a combination of R ₇ and R ₈ , a 5-membered ring, a 6-membered ring or 7
A member ring may be formed.

N represents 1 or 2. X Indicates an anion
You. That is, the present invention relates to the triarylamine-based compound
The nitrogen atoms of the four aminophenyl groups at the end of the
Characterized in that the nitrogen atom is located at the meta position
You.

 Hereinafter, the present invention will be described in detail.

In the general formulas [I] and [II], R _{1 to} R ₈ represent a hydrogen atom, a halogen group (for example, fluorine, chlorine, iodine, bromine, etc.) or a monovalent organic residue. The monovalent organic residue can be selected from a wide range, and particularly, an alkyl group (methyl group, ethyl group, n-propyl group, iso-
Propyl group, n-butyl group, iso-butyl group, t-butyl group, n-amyl group, t-amyl group, n-hexyl group, n-octyl group, t-octyl group, 2-ethylhexyl group, etc.), Alkoxy groups (methoxy group, ethoxy group, propoxy group, butoxy group, etc.) and further substituted alkyl groups include (2-
Hydroxyethyl group, 3-hydroxypropyl group, 4-hydroxybutyl group, 2-acetoxyethyl group, carboxymethyl group, 2-carboxyethyl group, 3-carboxypropyl group, methoxyethyl group, ethoxyethyl group, methoxypropyl group) Alkenyl groups (vinyl, propenyl, butenyl, pentenyl, hexenyl, heptenyl, octenyl, etc.) aryl groups (phenyl, tolyl, xylyl, ethylphenyl, methoxyphenyl, Chlorophenyl group, nitrophenyl group, dimethylaminophenyl group, diethylaminophenyl group, α-naphthyl group, β-naphthyl group),
As the aralkyl group (for example, benzyl group, p-chlorobenzyl group, p-methylbenzyl group, 2-phenylmethyl group, 2-phenylpropyl group, 3-phenylpropyl group, α
-Naphthylmethyl group, β-naphthylethyl group and the like, and the alkynyl group are preferably (propargyl group, butynyl group, pentynyl group, hexynyl group and the like).

R _{1 to} R ₈ may each be different or the same.

The combination of R ₁ and R ₂ , R ₃ and R ₄ , R ₅ and R _6, and R ₇ and R ₈ may form a substituted or unsubstituted 5-, 6- or 7-membered ring. Good. A substituted or unsubstituted 5-membered heterocyclic ring is a pyrrolidine ring, a substituted or unsubstituted 6-membered ring is a piperidine ring, a morpholine ring, a tetrahydropyridine ring, and a substituted or unsubstituted 7-membered ring is an azepine ring. It is.

A and B each represent an aromatic ring such as a benzene ring and a naphthalene ring; ) As B (for example, Etc.).

These aromatic rings may be substituted with a lower alkyl group, an alkoxy group, a halogen group, a hydroxyl group, a nitro group, a cyano group, or the like.

 X Is chlorine ion, bromide ion, iodine ion,
Chlorate ion, nitrate ion, benzene sulfonate
Ion, p-toluenesulfonate ion, methyl sulfate
Salt ion, ethyl sulfate ion, propyl sulfate ion
, Tetrafluoroborate ion, tetraphenylborate
Urate ion, hexafluorophosphate ion, benze
Sulfinate ion, acetate ion, trifluoro
Acetate ion, propion acetate ion, benzoate ion
ON, oxalate ion, succinate ion, malonic acid
Salt ion, oleate ion, stearate ion
Citrate ion, monohydrogen diphosphate ion, dihydrate
Monophosphate ion, pentachlorostannate ion,
Lorosulfonic acid ion, fluorosulfonic acid ion
Trifluoromethanesulfonate ion, hexaf
Fluoroarsenate ion, hexafluoroantimonate ion
ON, molybdate ion, tungstate ion
Negative ions such as iron, titanate and zirconate ions
Indicates ON.

The method for producing a triarylamine compound of the present invention comprises:
U.S. Patent Specification No.3251881, U.S. Patent Specification No.3575871,
The methods described in U.S. Pat. No. 3,484,467 and JP-A-61-69991 can be used. For example, it can be manufactured by the following process.

After the amino compound obtained by the above-mentioned Ullmann reaction and reduction reaction is substituted by selective substitution, for example, by alkylation, alkenylation, aralkylation, alkynylation, cyclization, etc., the final product obtained by oxidation reaction is used. do it.

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.

Next, specific examples of the triarylamine-based compound represented by the general formulas [I] and [II] according to the present invention are listed below, but are not limited thereto.

 For simplicity, A isAnd X Is ClO_Four And R₁, R_Two, R_Three, R_FourIs an ethyl group,
R_Five, R₆, R₇, R₈Is a methyl group,ClO_Four, C_TwoH_Five, C_TwoH_Five C_TwoH_Five, C_TwoH_Five CH_Three, CH_Three CH_Three, CH_ThreeWhen
Express.

 Also, B isAnd X Is Br And R₁And R_Two, R_ThreeAnd R_Four, R_FiveAnd R₆. R₇And R₈of
When combined to form a 5-membered ring,Br, CH_TwoCH_TwoCH_TwoCH_Two CH_TwoCH_TwoCH_TwoCH_Two CH_TwoCH_TwoCH_TwoCH_Two CH_TwoCH
_TwoCH_TwoCH_TwoIt is expressed as

The aminium salt compound or diimmonium salt compound exemplified above has a maximum absorption wavelength of 800 nm or more and an absorption peak having a large extinction coefficient of about tens of thousands to hundreds of thousands.

Such a triarylamine-based compound is used for a heat insulating film, sunglasses, etc. in addition to the use as a material for an optical recording medium.

Further, the triarylamine 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, a commonly known dye is used as a near-infrared absorbing dye for forming an organic dye thin film used in combination with these triarylamine compounds, such as a cyanine dye and a merocyanine dye. , Croconium dye, squarium dye, azulenium dye,
Polymethine dyes, naphthoquinone dyes, pyrylium dyes, phthalocyanine dyes, triphenylmethane dyes, xanthene dyes, anthraquinone dyes, dioxazine dyes, tetrahydrocholine dyes, triphenothiazine dyes, phenanthrene dyes, etc. .

The amount of the triarylamine-based compound comprising the aminium salt compound of the general formula [I] and / or the diimonium salt compound of the general formula [II] to these dyes is 1 to 60% by weight based on the total solid content, Preferably 5
-40% by weight, more preferably 10-30% 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,
Polyarylate resins such as 4'-sec-butylidene diphenylene carbonate), poly (4,4'-isopropylidene diphenylene carbonate-block-oxyethylene), or polyamides, polyimides, epoxy resins, phenolic 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.

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 the organic solvent is in a dispersed state or a dissolved state, but generally, alcohols such as methanol, ethanol, and isopropanol; ketones such as acetone, methyl ethyl ketone, cyclohexanone, and diacetone alcohol. 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.

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 , Si
Examples of metals such as O, TiO ₂ , ZnO, TiN, and SiN include Zn, Cu,
Ni, Al, Cr, Ge, Se, Cd, etc. are used as organic polymer compounds such as ionomer resins, polyamide resins, vinyl resins,
Natural polymers, epoxy resins, silane coupling agents and the like can be used.

At this time, the undercoat layer and / or the protective layer may contain the aminium salt compound or diimonium salt compound of the general formula [I] or [II] of the present invention. Further, the undercoat layer or the protective layer may contain a dispersant, a flame retardant, a lubricant, an antistatic agent, a surfactant, a plasticizer, and the like.

The thickness of the undercoat layer is from 50 to 100 μm, preferably from 200 to 100 μm.
30 μm is appropriate.

The thickness of the protective layer is 100 mm or more, preferably 1000 mm.
The above is appropriate.

The configuration of the optical recording medium of the present invention is such that two recording media comprising a recording layer and a substrate (an undercoat layer and a protective layer may be provided) (in some cases, only one of the substrates is a substrate) are May be arranged in a so-called air sandwich structure in which the layers are disposed inside, or a so-called close-contact structure (laminated structure) in which the layers are bonded via a protective layer.

The optical recording medium of the present invention can be recorded by irradiation with a gas laser such as a helium-neon laser (oscillation wavelength of 633 nm), but is preferably a laser having a wavelength of 750 nm or more, particularly a gallium-aluminum-arsenic semiconductor ( A method of recording by irradiation with a laser beam having an oscillation wavelength in the near-infrared or infrared region such as an oscillation wavelength of 830 nm is suitable. For reading, the aforementioned laser beam can be used. At this time, writing and reading can be performed by a laser having the same wavelength, or lasers having different wavelengths can be used.

EXAMPLES Next, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto. Parts are by weight unless otherwise specified.

<Synthesis Example 1> 0.1 mol of p-phenyldiamine, 0.67 mol of m-nitrochlorobenzene, 0.25 mol of anhydrous potassium carbonate, and 2 parts (by weight) of copper powder were stirred in 140 parts of dimethylformamide (DMF) under reflux for 4 minutes. Went for days.

After the reaction, the reaction mixture was filtered, and the product was thoroughly washed with DMF, water, and acetone, and then dried. There were obtained 25 parts of red-brown tetrakis (m-nitrophenyl) -p-phenyldiamine.

23 parts of the compound obtained above were added to an autoclave together with 95 parts of DMF and 2 parts of a palladium-carbon hydrogenation catalyst, and the mixture was stirred under hydrogen gas at 5.0 kg / cm ² at 90 to 100 ° C. until hydrogen absorption ceased.

After the reaction, the reaction solution was filtered, and the product was washed with DMF.
The liquid was poured into 330 parts of ice water. After stirring for a while, the precipitate was collected.

Recrystallization was performed with an ethanol-DMF mixed solvent to obtain 9 parts of tetrakis (m-aminophenyl) p-phenyldiamine. 97.5% purity measured by high performance liquid chromatography
Met.

Compounds having another central skeleton (for example, Was synthesized in the same manner.

<Synthesis of [I]-(1)> 19 parts of dimethylformamide, 0.8 parts of anhydrous sodium hydrogencarbonate, 4.0 parts of n-propyl bromide
The mixture was heated and stirred at 100 ° C to 130 ° C together with the parts. After reacting for 40 hours, the reaction solution was poured into 120 parts of ice water and extracted with ethyl acetate. After drying, it was purified on a silica gel column. Acquisition amount 3.5
And disappearance of absorption due to NH stretching vibration of the amino group was confirmed by infrared absorption spectroscopy.

2 parts of this compound was dispersed in 30 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 by filtration, and the filtrate was diluted with isopropyl ether (IPE) and allowed to stand to collect precipitated crystals.
This was recrystallized with an acetone-IPE mixed solvent to obtain 1.2 parts of platelet crystals.

The compound represented by the structural formula [I]-(1) thus synthesized has an absorption maximum wavelength of 920 nm and an extinction coefficient of 42,000.
Was a compound having a large absorption region in the infrared region.

<Synthesis of [II]-(1)> One part of tetrakis (m-aminophenyl) -p-phenyldiamine used in the synthesis of [I]-(1) was replaced with acetone.
It was dispersed in 15 parts and 2 parts mol 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 IPE. Take the precipitated crystals,
The crystals were recrystallized with an acetone-IPE mixed solvent to obtain 0.60 parts of crystals.

The example described above 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 to the anion. For example, AgSbF ₆ , AgBF ₄ , AgSO ₄ , AgNO ₃ , AgSO ₃
Silver salts such as C ₆ H ₄ CH ₃ and AgSO ₃ CF ₃ can be used.
In addition, it can also be obtained by electrolytic oxidation.

<Synthesis Example 2> 16 parts of 1,4-diaminonaphthalene was added to 2N hydrochloric acid aqueous solution 1
After dissolving in 20 parts, 15 parts of powdered tin was added with stirring, and the mixture was stirred for 2 hours. After the reaction, the reaction solution was poured into 600 parts of ice water, and the solution was neutralized with a 2N aqueous solution of NaOH to obtain an intended product. Yield 12 parts. This was reacted in the same manner as in Synthesis Example 1 to obtain 5 parts of tetrakis (m-aminophenyl) -1,4-diaminonaphthalene.

<Synthesis of [I]-(55)> 2 parts of the amino compound obtained in Synthesis Example 2 were combined with 12 parts of dimethylformamide, 0.6 parts of anhydrous sodium hydrogencarbonate, and 1.5 parts of 1,4-dibromopentane at 100 ° C to 130 ° C. The mixture was heated and stirred. After reacting for 37 hours, the reaction solution was poured into ice water and extracted with ethyl acetate. After drying, it was purified on a silica gel column. The obtained amount was 1.1 parts.
The disappearance of absorption due to stretching vibration was confirmed.

0.8 part of this compound was dispersed in 14 parts of acetone, and under stirring, equimolar silver hexafluoroantimonate was added. 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. With an acquisition amount of 0.6 parts, the maximum absorption wavelength was 920 nm.

<Synthesis of [II]-(55)> Pyrrolidine derivative obtained during the synthesis of [I]-(55)
While dispersing 0.5 part in 15 parts of acetone, 2 parts mol of silver hexafluoroantimonate was added at room temperature and stirred for 1 hour at room temperature. After the reaction, the same treatment as in [I]-(55) was performed to give 0.30
Obtained the desired product. It was an infrared absorbing compound with a maximum peak at 1105 nm.

Compounds having another central skeleton (for example, Was synthesized in the same manner to obtain an aluminum salt compound and a diimonium salt compound.

Next, examples using the triarylamine-based compounds represented by the general formulas [I] and [II] as optical recording materials will be described.

Example 1 An ultraviolet curable resin (2P method) on a polymethyl methacrylate (hereinafter referred to as PMMA) substrate having a diameter of 130 mm and a thickness of 1.2 mm
To form a 50 μm pregroup, on which an organic dye of a polymethine dye (IR-820 manufactured by Nippon Kayaku) and the triarylamine-based compound No. [I]-(1) are added at a weight ratio of 90:10.
A liquid dissolved in 1,2-dichloroethane was spin-coated to provide a recording layer of 900 °. 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 at 1800 rpm, and a recording power of 6 mW and a recording frequency of 2 MHz were applied from the substrate side using a semiconductor laser having a wavelength of 830 nm.
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.

Examples 2 to 8 On the same substrate as in Example 1, an optical recording medium having the composition shown in Table 2 was prepared in the same manner as in Example 1 using the dyes described below and the triarylamine-based compound. The test was performed in the same manner as in Example 1. Table 3 shows the results.
Shown in

Comparative Examples 1-3 In the same manner as in Examples 1, 2 and 5, except that the triarylamine-based compound used in Examples 1, 2 and 5 was removed,
An optical recording medium was prepared and evaluated. The results are shown in Table-3.

Examples 9 to 13 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 a tria shown in Table 4 below were provided thereon. A liquid obtained by mixing a reelamine-based compound in diacetone alcohol in the mixing ratio shown in Table 5 was applied by a bar coating method, and then dried to obtain a recording layer of 850 °. Furthermore, a 0.3 mm-thick PC substrate having a wallet size was bonded thereto by a hot roll method via an ethylene-vinyl acetate dry film to produce an optical recording medium having a close contact structure.

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 The signal strength of the unrecorded part, B → the signal strength of the recorded part) 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 4 and 5 Optical recording media were prepared and evaluated in the same manner as in Examples 10 and 13, except that the triarylamine compound was omitted in Examples 10 and 13. The results are shown in Table-6.

[Effects of the Invention] As described above, the triarylamine compounds represented by the general formulas [I] and [II] of the present invention have a large absorption region in the infrared region, and have lost linearity. As a result, the solubility could be improved.

When the triarylamine-based compound represented by the general formula [I] or [II] of the present invention is contained in an organic dye thin film and used as an optical recording medium, the durability and the light stability in repeated reproduction are provided. It has become possible to obtain an optical recording medium in which is greatly increased.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-236131 (JP, A) JP-A-62-30088 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C09B 57/00 B41M 5/26 CA (STN)

Claims (2)

(57) [Claims] 1. A compound represented by the following general formula [I] or [II]
Triarylamine compounds. (Where R₁, R_Two, R_Three, R_Four, R_Five, R₆, R₇, And R₈Is hydrogen field
, A halogen atom or a monovalent organic residue. R₁,
R_Two, R_Three, R_Four, R_Five, R₆, R₇, And R₈Are different even if
Or it may be the same. Also, R₁And R_Two, R_ThreeAnd R_Four, R_FiveWhen
R₆, And R₇And R₈5-, 6- or 7-membered ring
A member ring may be formed. N represents 1 or 2. X Indicates an anion
You. ) 2. The method according to claim 1, wherein the organic dye thin film has the following general formula [I]:
Contains a triarylamine compound represented by [II]
An optical recording medium, comprising: (Where R₁, R_Two, R_Three, R_Four, R_Five, R₆, R₇, And R₈Is hydrogen field
, A halogen atom or a monovalent organic residue. R₁,
R_Two, R_Three, R_Four, R_Five, R₆, R₇, And R₈Are different even if
Or it may be the same. Also, R₁And R_Two, R_ThreeAnd R_Four, R_FiveWhen
R₆, And R₇And R₈5-, 6- or 7-membered ring
A member ring may be formed. N represents 1 or 2. X Indicates an anion
You. )