JPH09258401A - Silver halide color photographic sensitive material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure superior spectral absorption characteristics, color reproducibility and light fastness by incorporating a specified 1H-imidazo[1,5- a]imidazole type dye forming coupler. SOLUTION: This sensitive material contains at least one king of dye forming coupler represented by the formula, wherein each of R1 and R2 is H or a substituent and X is H or a group released by a reaction with the oxidized body of a color developing agent. The coupler may form an oligomer through substituents represented by R1 and R2 and may bond to a polymer chain. It can be synthesized by a known method and is easily obtd., e.g. by bringing 4-aminoimidazole and α-haloketone into a condensation reaction.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a silver halide color photographic light-sensitive material containing a novel dye-forming coupler.

[0002]

2. Description of the Related Art In a silver halide color photographic light-sensitive material obtained by a subtractive color method, a color image is formed by three primary color dyes of yellow, magenta and cyan. Of these,
Cyan couplers have long been used in phenolic and naphthol couplers. However, the dyes obtained from these couplers have an undesired secondary absorption, or have an absorption spectrum that is broad and has unnecessary absorption, and therefore, improvements in color reproduction have been desired. Further, the molecular extinction coefficient of the obtained dye is small, a large amount of couplers and silver halides are required to obtain a desired color density, and the film thickness of the light-sensitive material becomes large, resulting in a decrease in the sharpness of the color image obtained. Had a problem.

Recently, as cyan couplers, pyrazoloazoles described in US Pat. No. 4,873,183, diphenylimidazoles described in European Patent 249,453A, and European Patents 491,197A. The pyrroloazoles described in 1) have been proposed as couplers having improved color reproducibility. However, all of the dyes derived from these couplers have poor light fastness and have a serious problem that the color image is faded by exposure for a relatively short time. Further, an imidazole-based coupler structurally similar to the present invention is disclosed in JP-A-6-27,612.
Although the light fastness of the color image is improved as described in JP-A No. 1994-242, the dye produced from the coupler has a large side absorption, and improvement in color reproducibility has been desired.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a dye-forming coupler which gives a dye having excellent hue and good light fastness, and also the color reproducibility and the color reproducibility containing the coupler. It is intended to provide a silver halide color photographic light-sensitive material having excellent sharpness and good color image fastness.

[0005]

DISCLOSURE OF THE INVENTION The present inventor diligently searched for a new coupler, and found that a dye-forming coupler represented by the following general formula and a silver halide color containing at least one of the couplers. It has been found that the above object can be achieved by a photographic light-sensitive material.

[0006]

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In the above formula, R ₁ and R ₂ represent a hydrogen atom or a substituent, and X represents a hydrogen atom or a group capable of leaving by the reaction with an oxidized product of a color developing agent.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The dye-forming coupler of the present invention is described in detail below. In the general formula, R ₁ and R ₂ each represent a hydrogen atom or a substituent, and X represents a hydrogen atom or a group which is released by a reaction with an oxidized product of a color developing agent. R ₁ and R ₂ are hydrogen atom, halogen atom (fluorine atom, chlorine atom, bromine atom), substituted or unsubstituted alkyl group (ethyl group, butyl group, octyl group, 2-ethylhexyl group, dodecyl group, hexadecyl group, t -Butyl group, t-octyl group, isopropyl group, isobutyl group, isodecyl group, isostearyl group, dodecyloxypropyl group, 3- (2,4-di-t-amylphenoxy) propyl group, trifluoromethyl group, benzyl Base,
2-phenethyl group, α-methylbenzyl group, methanesulfonylaminoethyl group, etc.), cycloalkyl group (cyclohexyl group, 4-t-butylcyclohexyl group, etc.), substituted or unsubstituted aryl group (phenyl group, p-tolyl group) , P-anisyl group, p-chlorophenyl group, 4-t-
Butylphenyl group, 2,4-di-t-amylphenyl group, etc.), heterocyclic group (2-furyl group, 2-thienyl group, 2
-Benzothiazolyl group, etc.), cyano group, hydroxyl group, nitro group, carboxyl group, substituted or unsubstituted amino group (amino group, methylamino group, dimethylamino group, anilino group, N-methylanilino group, etc.), alkoxy group (methoxy group) , Butoxy group, methoxyethoxy group, dodecyloxy group, 2-ethylhexyloxy group, etc.), aryloxy group (phenoxy group, p-tolyloxy group, p-chlorophenoxy group, 4-t-butylphenoxy group, etc.), acylamino group (Acetamide group, benzamide group, tetradecanamide group, 2- (2,4-di-t-amylphenoxy) butanamide group, 4- (3-t-butyl-4-hydroxyphenoxy) butanamide group, etc.), substituted ureido group (3-methylureido group, 3-phenylureido group, 3,3-dibutyl Ureido group), a substituted or unsubstituted carbamoyl group (ethylcarbamoyl group, dibutylcarbamoyl group, dodecyloxypropylcarbamoyl group, 3- (2,4-di-t-amylphenoxy) propylcarbamoyl group, piperidinocarbonyl group, Morpholinocarbonyl group etc.), alkoxycarbonylamino group (ethoxycarbonylamino group, dodecyloxycarbonylamino group etc.), alkylthio group (butylthio group, dodecylthio group, hexadecylthio group, 3-phenoxypropylthio group etc.), arylthio group (phenylthio

Group, 4-t-butylphenylthio group, 2-
Butoxy-5-t-octylphenylthio group, 4-tetradecanamidophenylthio group, etc.), sulfonamide group (methanesulfonamide group, butanesulfonamide group,
Hexadecanesulfonamide group, benzenesulfonamide group, p-toluenesulfonamide group, 2-butoxy-
5-t-butylbenzene sulfonamide group, 2-octyloxy-5-t-octylbenzenesulfonamide group, etc.), substituted or unsubstituted sulfamoyl group (sulfamoyl group, ethylsulfamoyl group, diethylsulfamoyl group, ethyl Dodecylsulfamoyl group, phenylsulfamoyl group, 2-chlorophenylsulfamoyl group, 3- (2,4-di-t-amylphenoxy) propylsulfamoyl group), sulfonyl group (methanesulfonyl group, benzene) Sulfonyl group, p-toluenesulfonyl group, dodecylsulfonyl group, 4-t-octylbenzenesulfonyl group, etc.), alkoxycarbonyl group (ethoxycarbonyl group, dodecyloxycarbonyl group, isotetradecyloxycarbonyl group, etc.), aryloxycarbonyl group (Fe Alkoxycarbonyl group, p-t-octylphenyl group), an acyl group (acetyl group,
Benzoyl group, p-toluoyl group, etc., acyloxy group (acetoxy group, dodecanoyloxy group, benzoyloxy group, p-t-butylbenzoyloxy group, etc.), imide group (phthalimido-1-yl group, 1-benzylhydantoin) -3-yl group, 3-octadecenylsuccinimido-1-yl group, etc.), sulfinyl group (octylsulfinyl group, dodecylsulfinyl group, 3-pentadecylphenylsulfinyl group, etc.), phosphoryl group (diethylphosphoryl group, dioctyl group) Phosphoryl group, didodecylphosphoryl group, etc.), heterocyclic group (2-pyridyl group, 4-pyridyl group, 2-thienyl group, 2-thiazolyl group, 2-benzothiazolyl group, 1-benzotriazolyl group, 5- And a methyltetrazol-2-yl group). Among these substituents, those substitutable may be further substituted with other substituents.

Preferred dye-forming couplers in the present invention include those in which R ₁ is an electron withdrawing group having a Hammett σ _P value of 0.3 or more. Further, particularly preferable dye-forming couplers in the present invention are R ₁ , R ₂
Both of which are electron withdrawing groups having a Hammett σ _P value of 0.3 or more. In the coupler of the present invention, when a strong electron-withdrawing group is introduced into R ₁ and R ₂ , absorption of the formed dye shifts to a long wave, and in oxidative coupling with a phenylenediamine-based color developing agent, a cyan dye or a hydrazine-based reducing agent is used. Oxidative coupling with and exhibits favorable absorption characteristics as a magenta or blue dye. On the other hand, those in which R ₁ and R ₂ are not electron withdrawing groups are useful as magenta couplers in oxidative coupling with phenylenediamine color developing agents. Oxidative coupling with a hydrazine-based color-forming reducing agent exhibits favorable absorption characteristics as a yellow or orange dye.

The Hammett σ _p value is described in many books, for example, “Summary of Chemistry”, No. 122, 96.
Page 103, 1979 (Nankodo) and Chemical Review
s, Vol.91, 165-195 (1991) for detailed description. As the electron withdrawing group having a σ _p value of 0.3 or more, which is useful in the present invention, not only those described in the above-mentioned publications but also those described in various documents can be applied. Specific examples of the electron withdrawing group having a σ _p value of 0.3 or more include a nitro group, a cyano group, an alkylsulfonyl group, an arylsulfonyl group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group,
Substituted or unsubstituted carbamoyl group, substituted or unsubstituted sulfamoyl group, dialkylphosphoryl group, dialkylphosphono group, diarylphosphono group, dialkylphosphinyl group, diarylphosphinyl group, alkylsulfinyl group, arylsulfinyl group, perfluoro Examples thereof include an alkyl group and a pentahaloaryl group.

Preferred examples of R ₁ and R ₂ are cyano group, alkoxycarbonyl group (ethoxycarbonyl group,
Isohexadecyloxycarbonyl group, 2,6-di-t
-Butyl-4-methylcyclohexyloxycarbonyl group, etc.), perfluoroalkyl group (trifluoromethyl group, heptafluoropropyl group, etc.), acyl group (acetyl group, benzoyl group, etc.), sulfonyl group (methanesulfonyl group, benzenesulfonyl group) Group), carbamoyl group (ethylcarbamoyl group, phenylcarbamoyl group, dodecylcarbamoyl group, etc.), sulfamoyl group (butylsulfamoyl group, phenylsulfamoyl group, dodecylsulfamoyl group, etc.), sulfinyl group (methylsulfinyl group) Etc.), phosphoryl group (diethylphosphoryl group etc.), phosphinyl group (diethylphosphinyl group etc.),
Examples thereof include aryl groups (pentafluorophenyl group, 4-nitrophenyl group, etc.).

Particularly preferred R ₁ is a cyano group, an alkoxycarbonyl group, an aryl group and a perfluoroalkyl group.

Particularly preferred R ₂ is a cyano group, an alkoxycarbonyl group, a carbamoyl group, an aryl group and a perfluoroalkyl group.

X represents a hydrogen atom or a group capable of splitting off upon reaction with an oxidized product of a color developing agent, and specific examples thereof include a halogen atom (fluorine atom, chlorine atom, bromine atom, etc.), an alkoxy group (ethoxy group, Methoxycarbonylmethoxy group, carboxypropyloxy group, methanesulfonylethoxy group, etc.), aryloxy group (4-carboxyphenoxy group, 4- (4-hydroxyphenylsulfonyl) phenoxy group, etc.), acyloxy group (acetoxy group, benzoyloxy group) Etc.), sulfonyloxy group (methanesulfonyloxy group, benzenesulfonyloxy group, etc.), acylamino group (heptafluorobutyrylamino group, etc.), sulfonamide group (methanesulfonamide group, etc.), alkoxycarbonyloxy group (ethoxycarbonyloxy, etc.) Base etc.) Carbamoyloxy group (diethylcarbamoyloxy group, piperidinocarbonyloxy group, morpholinocarbonyloxy group, etc.), alkylthio group (2-carboxyethylthio group, etc.), arylthio group (2-octyloxy-5-t-octylphenylthio) Group, 2- (2,4-di-t-amylphenoxy) butyrylaminophenylthio group, etc.), heterocyclic thio group (1-phenyltetrazolylthio group, 2-benzimidazolylthio group, etc.), 5-membered Alternatively, a 6-membered nitrogen-containing heterocyclic group (1-
Imidazolyl group, 1-pyrazolyl group, 1-benzotriazolyl group, 2-phenylcarbamoyl-1-imidazolyl group, etc.), imide group (5,5-dimethylhydantoin-
3-yl group, 1-benzylhydantoin-3-yl group,
5,5-dimethyloxazolidine-2,4-dione-3
-Yl group, etc.), azo group (4-methoxyphenylazo group,
4-pivaloylaminophenylazo group, etc.), a bis-type coupler having a coupling position and an alkylidene group, and the like. Further, it may be a leaving group having a timing function of releasing the development inhibitor or the development accelerator by electron transfer or intramolecular nucleophilic substitution through the leaving group after the leaving.

Preferred examples of X include hydrogen atom, chlorine atom, aryloxy group (phenoxy group, 4-carboxyphenoxy group, etc.), carbamoyloxy group (diethylcarbamoyloxy group, morpholinocarbonyloxy group, etc.), arylthio group ( 2-octyloxy-5-t-
Octylphenylthio group, etc.), heterocyclic thio group (phenyltetrazolylthio group, etc.), nitrogen-containing 5-membered heterocyclic group (imidazolyl group, pyrazolyl group, etc.), imide group (5,5-
Dimethylhydantoin-3-yl group, 1-benzyl-5
-Ethoxyhydantoin-3-yl group etc.) and the like.

The coupler represented by the general formula is R _{1 to} R ₂
A dimer or higher multimer may be formed via the substituent of, and it may be bound to a polymer chain. Hereinafter, specific examples of the coupler of the present invention are shown, but the present invention is not limited thereto.

[0018]

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[0019]

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[0020]

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[0021]

[Chemical 6]

[0022]

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[0023]

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[0024]

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[0025]

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The compounds of the present invention can be synthesized by well-known methods. For example, it can be easily obtained by a condensation reaction between 4-aminoimidazoles and α-haloketones. Hereinafter, a specific synthesis example will be shown.

Synthesis Example 1: Synthesis of coupler (1) 4-amino-5-cyanoimidazole, 5.4 g; α-bromo-
2,3,4,5,6-pentafluoroacetophenone, 14.5g;
A mixture of anhydrous potassium carbonate, 6.9 g and acetone, 40 ml was heated under reflux for 3 hours. After allowing to cool, pour the reaction solution into water,
It was extracted with ethyl acetate. After washing the extract with water, the solvent was distilled off under reduced pressure, 30 ml of acetic acid was added to the residue, and the mixture was heated under reflux for 2 hours. After allowing to cool, the reaction solution was poured into water and extracted with ethyl acetate. The extract was washed with water, concentrated, and subjected to silica gel column chromatography (eluent: hexane / ethyl acetate = 2 /
Purification in 1) gave 6.8 g of white crystals of coupler (1).

Synthesis Example 2: Synthesis of coupler (2) A mixture of the coupler (1) obtained in the above Synthesis Example 1 (2 g); ethanol, 40 ml and concentrated sulfuric acid (10 ml) was heated under reflux for 5 hours. The reaction solution was poured into ice water and neutralized with sodium carbonate. The mixture was extracted with ethyl acetate, the extract was washed with water, dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. 2-on the residue
Hexyl-1-decanol (20 ml) and tetraisopropoxy titanium (1.0 g) were added, and the mixture was refluxed at 120 ° C. for 3 hours.
After cooling, the reaction solution was directly purified by silica gel chromatography, and off-white crystals of coupler (2), 2.
4 g, melting point 108-112 ° C. were obtained. Other couplers can be synthesized in a similar manner.

The light-sensitive material of the present invention may have at least one layer containing the coupler of the present invention on a support,
The coupler is usually contained in a hydrophilic colloid layer consisting of a gelatin binder. A general light-sensitive material can be constructed by coating at least one blue-sensitive silver halide emulsion layer, at least one green-sensitive silver halide emulsion layer and at least one red-sensitive silver halide emulsion layer on a support. The order may be any order. An infrared-sensitive silver halide emulsion layer can also be used in place of at least one of the above-mentioned photosensitive emulsion layers. These light-sensitive emulsion layers contain a silver halide emulsion having sensitivity in each wavelength range and a coupler that forms a dye having a complementary color with the light to be exposed, so that color reproduction by the subtractive color method can be performed. Can be. However, the photosensitive emulsion layer and the hue of the coupler may not have the above correspondence. The couplers of this invention are useful as yellow, magenta or cyan couplers but can be incorporated in any of the light sensitive silver halide emulsion layers. The amount of the coupler of the present invention added to the light-sensitive material is appropriately 1 × 10 ⁻³ to 1 mol, and preferably 2 × 10 ^{−3 to} 3 × 10 ⁻¹ mol, per mol of silver halide.

The coupler of the present invention can be introduced into a light-sensitive material by various known dispersion methods, but it is dissolved in a high-boiling organic solvent (a low-boiling organic solvent may be used in combination) and emulsified and dispersed in a gelatin aqueous solution to form a silver halide. An oil-in-water dispersion method of adding to an emulsion is preferably used. Examples of the high boiling point organic solvent used in the oil-in-water dispersion method are described in US Pat. No. 2,322,027. A specific example of the latex dispersion method as one of the polymer dispersion methods is disclosed in US Pat. No. 4,199,3.
No. 63, West German Patent (OLS) No. 2,541,274,
It is described in JP-B-53-41,091 and the like. Further, a dispersion method using an organic solvent-soluble polymer is described in PCT International Publication No. WO88 / 723.

As the high boiling point organic solvent which can be used in the oil-in-water dispersion method, phthalic acid esters (dibutyl phthalate, dioctyl phthalate, di-2-ethylhexyl phthalate, etc.), phosphoric acid or phosphonic acid esters are used. (Triphenyl phosphate, tricresyl phosphate, tri-phosphate
2-ethylhexyl, etc.), fatty acid esters (di-2-ethylhexyl succinate, tributyl citrate, etc.), benzoic esters (2-ethylhexyl benzoate, dodecyl benzoate, etc.), amides (N, N-diethyldodecane) Amides, N, N-dimethyloleinamides, etc., alcohols or phenols (isostearyl alcohol, 2,4-di-tert-amylphenol, etc.), anilines (N, N-dibutyl-2-butoxy-5-te)
rt-octylaniline, etc.), chlorinated paraffins, hydrocarbons (dodecylbenzene, diisopropylnaphthalene, etc.), carboxylic acids (2- (2,4-di-tert-
Amylphenoxy) butyric acid and the like. As an auxiliary solvent, an organic solvent having a boiling point of 30 ° C. or higher and 160 ° C. or lower (ethyl acetate, butyl acetate, methyl ethyl ketone, cyclohexanone, methyl cellosolve acetate, dimethylformamide, etc.) may be used in combination. The high boiling point organic solvent is used in an amount of 0 to 10 times, preferably 0 to 4 times the weight of the coupler.

The silver halide emulsions and other materials used in the present invention, the layer structure of the light-sensitive material, and the processing method and processing additive applied to process the light-sensitive material are described in JP-A- 62-215,272, JP-A-2-33,144, JP-A-2-854, JP-A-2-93,
Those described in No. 641, No. 3-194,539 and the like are preferably used. Examples of the compound that forms a dye by oxidative coupling with the coupler of the present invention include not only conventional aromatic primary amine compounds (for example, phenylenedisimine type color developing agents) but also European Patent 545491A1,
The sulfonylhydrazine compounds and carbamoylhydrazine compounds described in JP-A-565165A1 and Japanese Patent Application No. 7-49287 can be used. The coupler of the present invention is also preferably used in a photosensitive material for an advanced photo system having a magnetic recording layer. The coupler of the present invention can also be applied to a system for heat development using a small amount of water or a complete dry system for heat development without using water at all. Regarding these systems, JP-A-6-35,
118, 6-17,528, JP-A-56-14
6,133, 60-119,557, JP-A-1-
161, 236 and the like have detailed description. Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited thereto.

[0033]

【Example】

Example 1 (Preparation of Sample 101) An emulsified dispersion of the comparative coupler (C-1) was prepared by the method described below.

[0034]

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0.85 g of comparative coupler (C-1) and tricresyl phosphate, 1.2 g of ethyl acetate, 10 m
It was dissolved in 1 by heating (this is an oil phase liquid). Separately, 4.2 g of gelatin was added to 25 ml of room temperature water to sufficiently swell, and then heated to 40 ° C. to completely dissolve it. While maintaining this gelatin aqueous solution at about 40 ° C., 3% of a 5% aqueous sodium dodecylbenzenesulfonate solution and the oil phase liquid prepared above were added, and the mixture was emulsified and dispersed with a homogenizer to prepare an emulsified dispersion. A coating solution having the following composition was prepared using this emulsified dispersion, and the coupler was coated on a polyethylene laminated paper having an undercoat layer (containing 15% by weight of titanium oxide in polyethylene) so that the coupler has a concentration of 1 mmol / m ^2. did. Further, 2 g / m ² of gelatin was coated on this as a protective layer to prepare Sample 101.

(Coating liquid) Emulsion: Silver chlorobromide (Br 1 mol%) 13 g 10% gelatin 28 g Emulsion dispersion 22 g Water 37 ml 1-Hydroxy-3,5-dichloro-s-triazine sodium 4% aqueous solution 5 ml

(Production of Samples 102 to 110) Sample 101
In Comparative Example 1, except that an equimolar amount of the coupler of the present invention shown in Table 1 was added instead of the comparative coupler (C-1).
Samples 102 to 110 were prepared in the same manner as 01.

The sample produced as described above was subjected to wedge exposure with white light, and color development processing was performed by the following processing steps. Next, these samples were subjected to light irradiation with a xenon fading tester (100,000 lux) for 6 days to perform a forced fading test. The residual density after the test when the density before the test was 1.0 was measured and used as a measure of the image fastness. Table 1 shows the results
It was shown to.

[0039]

[Table 1]

(Treatment Step) Step Temperature Time Color Development 35 ° C. 45 seconds Bleaching Fixing 30-35 ° C. 45 seconds Stable 30-35 ° C. 20 seconds Stable 30-35 ° C. 20 seconds Stable 30-35 ° C. 20 seconds Drying 70- 80 ° C., 60 seconds The composition of each treatment liquid is as follows.

(Color Developer) Water 700 ml Ethylenediaminetetraacetic acid 3.0 g Triethanolamine 12.0 g Sodium chloride 6.5 g Potassium bromide 0.03 g Potassium carbonate 7 g N-ethyl-N- (β-methanesulfonamidoethyl) -3-Methyl-4-aminoaniline sulfate 5.0 g Disodium-N, N-bis (sulfonate ethyl) hydroxylamine 10.0 g 1,2-Dihydroxybenzene-4,6-disulfonic acid disodium salt 0. 5 g Sodium triisoprene (β) sulfonate 0.1 g Sodium sulfite 0.1 g Fluorescent brightener (WHITEX4, manufactured by Sumitomo Chemical Co., Ltd.) 1.0 g Water is added to the above to make 1000 ml. pH (25 ° C) = 10.0

(Bleaching Fixing Solution) Water 600 ml Ammonium thiosulfate aqueous solution (700 g / liter) 100 ml Sodium sulfite 40 g Ethylenediaminetetraacetic acid iron (III) ammonium 55 g Ethylenediaminetetraacetic acid disodium 5 g Ammonium bromide 40 g Nitric acid (67%) 30 g Water above To 1000 ml. pH (25 ° C) = 5.8

(Stabilizer) Ion-exchanged water (3 ppm each for calcium and magnesium)
As will be clear from Table 1 below, the couplers of the present invention have excellent light fastness.

Example 2 Comparative coupler (C-2), 0.81 g; N-ethyl-N
-(Β-methanesulfonamidoethyl) -3-methyl-
4-aminoaniline sulfate, 0.80 g; sodium carbonate, 3.75 g; chloroform, 60 ml and water,
Ammonium persulfate, 1.65 in 0 ml of mixture
g was dissolved in water and 10 ml, and slowly added at room temperature with stirring. After stirring for 1 hour, the chloroform layer was separated and purified by silica gel chromatography to obtain an azomethine dye (CD-2). Also, coupler, C-2
Instead of, the azomethine dyes D-1 to D-4 were similarly synthesized using the coupler of the present invention.

[0045]

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Azomethine dye, CD-2 (1.5 mg) was precisely weighed in a 100 ml measuring flask, ethyl acetate was added to dissolve it, and the solution was diluted to 100 ml to prepare a sample solution 201. The sample solution was put in a quartz cell having a thickness of 1 cm, and the visible absorption spectrum was measured by an ultraviolet-visible spectrophotometer manufactured by Shimadzu Corporation. Similarly, the ethyl acetate solutions 202 to 205 of the azomethine dyes D-1 to D-4 were prepared, and the absorption spectra were measured. Next, in the absorption characteristics of the dye, the intensity of the sub-absorption /
The absorption intensity at λmax = b / a was evaluated. b / a
It can be said that the smaller the value is, the more preferable the absorption characteristic is in terms of color reproduction.
The results are summarized in Table 2. The visible absorption spectrum of the dye (D-1) obtained from the coupler (1) of the present invention is shown in FIG.

[0047]

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[0048]

[Table 2]

From Table 2, it can be seen that the dye obtained from the coupler of the present invention has a small side absorption and an excellent spectral absorption characteristic.

[0050]

The dye obtained from the coupler of the present invention has excellent spectral absorption characteristics and good color reproducibility. Further, the color image obtained from the coupler of the present invention is excellent in light fastness.

[Brief description of drawings]

FIG. 1 is a visible absorption spectrum of an azomethine dye (D-1) in ethyl acetate. The vertical axis represents the absorption concentration,
The horizontal axis represents wavelength (nm).

Claims (3)

[Claims] 1. A silver halide color photographic light-sensitive material containing at least one 1H-imidazo [1,5-a] imidazole dye-forming coupler represented by the following general formula. Embedded image In the above formula, R ₁ and R ₂ represent a hydrogen atom or a substituent, and X represents a hydrogen atom or a group which is released by a reaction with an oxidized product of a color developing agent. 2. In the above general formula, R ₁ is Hammett σ
_The silver halide color photographic light-sensitive material according to claim 1, which is an electron-withdrawing group having a _P value of 0.3 or more. 3. The silver halide color photographic light-sensitive material according to claim ₁ , wherein in the general formula, both R ₁ and R ₂ are electron withdrawing groups having a Hammett σ _P value of 0.3 or more. .