Abstract: A silver halide color photographic light-sensitive material, having at least one yellow dye image-forming layer, at least one magenta dye image-forming layer, and at least one cyan dye image-forming layer, each provided on a transparent support,

Abstract: A silver halide emulsion which exhibits superior latent image stability when subjected to subjected to digital exposure at a high intensity for a short time is disclosed, comprising silver halide gains containing at least 90 mol % chloride, 0.02 to 5.0 mol % bromide and 0 to 2.0 mol % iodide, based on silver and occluding at least one Group 8 metal compounds and at least one iridium compound, and the silver halide grains are subjected to selenium sensitization which is undergone in the presence of at least one of compounds represented by the following formulas and silver or gold sulfide grains. A preparation method of the emulsion is also disclosed.

Abstract: The present invention provides a photosensitive silver halide photographic emulsion comprising a silver iodide content of 41 mol % or more and 100 mol % or less and including a silver halide to which reduction sensitization is applied in the course of particle formation, and silver halide photographic emulsion comprising 41 mol % to 100 mol % of silver iodide and subjected to at least one of chalcogen sensitization and gold sensitization to the insides of particles.

Abstract: A photoconductive material imaging element is described comprising a support and a silver halide emulsion imaging layer comprising silver halide grains which have not been chemically sensitized to optimize formation of latent image Agno, centers upon imagewise exposure and which are doped with at least 500 deep electron trapping agent dopant centers per grain. In accordance with a preferred embodiment, the photoconductive material imaging element includes a planar support and the non-chemically sensitized, deep electron trapping agent doped silver halide grains comprise tabular grains, preferably with an average grain size equivalent circular diameter of greater than 2 &mgr;m, with the long dimensions of the tabular grains primarily oriented parallel to the plane of the support.

Abstract: A silver salt photothermographic dry imaging material including non-photosensitive aliphatic carboxylic acid silver salts; a photosensitive emulsion containing photosensitive silver halide grains; a silver ion reducing agent; a binder; and a cyan coloring leuco dye. A percentage of the photosensitive silver halide grains having a mean particle size of 0.01 or more &mgr;m and 0.04 &mgr;m or less is 5% or more by mass and 50% or less by mass of total photosensitive silver halide grains by conversion into a silver amount.

Abstract: A silver halide color photographic light-sensitive material having, on a support, a yellow dye-forming light-sensitive silver halide emulsion layer, a magenta dye-forming light-sensitive silver halide emulsion layer and a cyan dye-forming light-sensitive silver halide emulsion layer, and a light-insensitive hydrophilic colloid layer that does not develop a color, wherein a total amount of a hydrophilic binder on the emulsion layer-coating side of the support is 6.0 g/m2 or less, and at least one of said silver halide emulsion layers contains at least one compound selected from metal complexes represented by formula (I) set forth below and a silver halide emulsion of a 90 mole % or more silver chloride content with a silver bromide-containing phase formed in a layer form.

Abstract: A process for incorporating dopants in a silver halide emulsion is described comprising precipitating silver halide emulsion grains in a reaction vessel, wherein at least one gallium dopant, at least one Group 8 metal dopant, and at least one selenium dopant are introduced into the reaction vessel during precipitation of the silver halide grains; where the gallium dopant is introduced in the form of a gallium halide coordination complex of the formula (I): [RxNHy]3GaX6 wherein R represents a lower alkyl group of from 1-3 carbon atoms; X is Cl, Br, or I; and x is from 1-3, y is from 1-3, and x+y=4; and the Group 8 metal dopant satisfies the formula (II): [ML6]n wherein n is −2, −3 or −4; M is a Fe+2, Ru+2, or Os+2 ion; and L6 represents bridging ligands which can be independently selected, provided that at least four of the ligands are anionic ligands, and at least one of the ligands is a cyano ligand or a ligand more electronegative than a c

Abstract: A photoconductive material imaging element is described comprising a support and a silver halide emulsion imaging layer comprising silver halide grains which have not been chemically sensitized to optimize formation of latent image Agn0 centers upon imagewise exposure and which are doped with at least 500 deep electron trapping agent dopant centers per grain. In accordance with a preferred embodiment, the photoconductive material imaging element includes a planar support and the non-chemically sensitized, deep electron trapping agent doped silver halide grains comprise tabular grains, preferably with an average grain size equivalent circular diameter of greater than 2 &mgr;m, with the long dimensions of the tabular grains primarily oriented parallel to the plane of the support.

Abstract: A silver halide photographic emulsion is disclosed, comprising silver chloroiodide grains or silver chloroiodobromide grains, having 90 mol % or more of a silver chloride content, wherein the silver chloroiodide grains or silver chloroiodobromide grains have a layer having a silver iodide content of decreasing in the depth direction from the grain surface.

Abstract: A radiation-sensitive emulsion is disclosed comprised of cubic silver iodochlorobromide grains comprising 0.25 to about 1.5 mol % iodide, 1 to about 25 mol % chloride, and from about 73.5 to 98.75 mol % bromide, each based on total silver in the emulsion, wherein the grains have an average equivalent circular diameter of greater than 0.6 micrometers and contain from 10−7 to 10−3 mole per silver mole of a metal ion coordination complex dopant of Formula (I) in an internal region of the grains formed after 10 percent and before 95 percent of the total grain silver has been precipitated: [ML6]n  (I) wherein n is zero, −1, −2, −3 or −4, M is a filled frontier orbital polyvalent metal ion, other than iridium, and L6 represents bridging ligands which can be independently selected, provided that at least four of the ligands are anionic ligands, and at least one of the ligands is a cyano ligand or a ligand more electronegative than a cyano ligand.

Abstract: A silver halide photographic material comprising a support having thereon at least one silver halide emulsion layer, wherein the material is contained at least one complex selected from complexes having a compound represented by the following formula (I) as at least one of their respective ligands or complexes having a diketone compound as at least one of their respective ligands: wherein X represents an atom or atomic group bridging two pyridine rings, each of R1 to R4 represents a hydrogen atom or a substituent group, and each of R1′ to R2′ represents a hydrogen atom or a substituent group.

Abstract: The Silver halide grains in the silver halide emulsion is disclosed, comprising silver halide grains containing three or more kinds of transition metal complexes each having a different electron-releasing time respectively classified into any of Class A (100 seconds or more), Class B (more than {fraction (1/10)} seconds and less than 100 seconds), Class C (more than {fraction (1/1000)} seconds and {fraction (1/10)} seconds or less) and Class D ({fraction (1/1000)} seconds or less).

Abstract: A silver halide emulsion is disclosed, comprising at least one monovalent Au(I) complex coordinated with a compound represented by the following formula (1):

Abstract: A photothermographic material is disclosed, comprising a light-insensitive silver salt of an aliphatic carboxylic acid and light-sensitive silver halide grains, a reducing agent for silver ions and a binder, wherein the photothermographic material further comprises a compound represented by the following formula, and the photothermographic material meets the following requirement:

Abstract: A silver halide photographic emulsion is disclosed, comprising silver chloroiodide grains or silver chloroiodobromide grains, having 90 mol % or more of a silver chloride content, wherein the silver chloroiodide grains or silver chloroiodobromide grains have a layer having a silver iodide content of decreasing in the depth direction from the grain surface.

Abstract: This invention relates to an organothiosulfonato Au(I) complex having the formula [A—SO2S—Au—SSO2—A]n−M+n wherein M is a cationic counter ion; A is a substituted or unsubstituted organic group; and n is 1 to 4; and wherein the compound is symmetrical. It further relates to the synthesis of said compounds.

Abstract: Disclosed are a silver halide emulsion and a silver halide photosensitive material copmrising a support and at least one photosensitive layer comprising the silver halide emulsion. The photosensitive emulsion comprises silver halide grains, wherein the silver chloride content is 90 mole % or more; the silver halide grains contain (I) at least one member of a six-coordinated complex in which iridium (Ir) is a central metal having halogen atom and O, H2O, thiazole or substituted thiazole as ligands and (II) at least one member of a six-coordinated complex in which iridium (Ir) is a central metal having halogen atom as a ligand; and the iridium compound (II) is present in a localized silver bromide phase.

Abstract: A color photographic silver halide material which can be developed to form a negative, at least 95 mol % of the silver halides of which consist of AgCl, and which contains at least one light-sensitive silver halide emulsion layer, the silver halide of which contains at least one compound of formulae (I), (II) and (III): [IrClnF6-n]2−M2+  (I) wherein n denotes 0 or an integer from 1 to 6 and M2+ denotes 1 or 2 cations with a total number of 2 positive charges, [Fe(CN)6]m−Mm+  (II) wherein m denotes 2 or 3 and Mm+ denotes 1 to 3 cations with a total number of m positive charges, wherein o denotes 0, 1 or 2 and R denotes an alkyl, aryl or aralkyl, is distinguished under scanning exposure and on analogue exposure by sharp contrast which is independent of exposure time and by a stable latent image.

Abstract: The invention provides a photothermographic material including, on a same surface of a substrate, photosensitive silver halide grains, a non-photosensitive organic silver salt, a reducing agent and a binder, in which the photosensitive silver halide grains include iridium and a metal of groups 3 to 10 of the periodic table other than iridium, and 90% or more of the total iridium amount within the grain are contained in a core of 50% or less of the grain.

Abstract: This invention relates to a photographic element comprising a support and a silver halide emulsion layer, the emulsion layer comprising a water soluble Au(I) complex having the formula [L—Au—L]n−M+n wherein the complex is symmetrical; L is an organothiosulfonato ligand which is an antifogging, stabilizing, or sensitizing compound, n is 1 to 4, and M is a cationic counterion. This invention further relates to a silver halide photographic element comprising a support and a silver halide emulsion layer, the emulsion layer comprising an organothiosulfonato Au(I) complex having the formula [A—SO2S—Au—SSO2—A]n−M+n wherein M is a cationic counterion; A is a substituted or unsubstituted organic group; and n is 1 to 4; and wherein the compound is symmetrical. It further relates to a method of preparing a silver halide emulsion utilizing said organothiosulfonato Au(I) complexes.

Abstract: This invention relates to a silver halide photographic emulsion in which a silver emulsion high in silver iodide content of 80% by mol to 100% by mol based on the silver iodide content is chemically sensitized by at least one of methods of chalcogen sensitization and gold sensitization under the conditions that pAg is from 1.5 to 7.0, as well as a thermally developable photosensitive material having at least one image forming layer containing at least a non-photosensitive organic silver salt, a photosensitive silver halide, a reducing agent and a binder on a support, and having at least one non-image recording protection layer to the image forming layer on the side remote from the support, and exposed by a laser beam in which the material contains the silver emulsion high in silver iodide content.

Abstract: High-speed black-and-white photothermographic materials can be imaged in any suitable fashion using ultraviolet, visible, infrared, or X-radiation. They can have one or more thermally developable imaging layers on either or both sides of the support and can be imaged with or without a phosphor intensifying screen in an imaging assembly. The photothermographic emulsions and materials have a net Dmin less than 0.25, and require less than 1 erg/cm2 to achieve a density of 1.00 above net Dmin.

Abstract: A silver halide emulsion is disclosed, comprising at least one monovalent Au(I) complex coordinated with a compound represented by the following formula (1): R1—Ch—R2  (1) wherein R1 and R2 each independently represents an alkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group, R1 and R2 may combine with each other to form a 3-, 4-, 5-, 6- or 7-membered ring, and Ch represents a sulfur atom, a selenium atom or a tellurium atom.

Abstract: A silver halide emulsion having a silver chloride content of 90 mol % or more which has been chemically sensitized with a compound capable of releasing an AuICh− ion is described, wherein grains of the silver halide contain in the shell portion thereof 0.01 to 0.50 mol % of silver iodide per mol of the total silver, with Ch representing S, Se or Te.

Abstract: Provided are a silver halide photographic emulsion containing a metal complex represented by the following formula (I):

Abstract: The object of the present invention is to provide a photothermographic material improved in the aging stability of unprocessed photosensitive material and/or in the image stability after the processing, which is a photothermographic material of the invention comprising a support and on the same surface of the support, a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent and a binder, wherein the concentration of chloride contained on the same surface is 1,000 ppm or less based on the organic silver salt.

Abstract: Disclosed are photothermographic materials having, on a support, a layer that contains at least a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent and a binder, in which the mean silver iodide content of the photosensitive silver halide falls between 5 and 100 mol %, preferably between 40 and 100 mol %.

Abstract: Disclosed is a method for chemical sensitization of a silver halide emulsion comprising a sensitization step of subjecting the silver halide emulsion to chemical sensitization with a chalcogen compound or a chalcogen compound and a gold compound to produce silver chalcogenide or gold silver chalcogenide, wherein the chemical sensitization is performed under such conditions that at least a part of the silver chalcogenide or gold silver chalcogenide produced in the sensitization step can be amorphized. This method can provide a silver halide emulsion showing high sensitivity without increasing fog and degrading storability and such a silver halide emulsion.

Abstract: The invention relates to a photographic label comprising a pragmatic polymer sheet, at least one layer comprising at least one image forming layer comprising photosensitive silver halide grains and dye forming coupler above said pragmatic polymer sheet, wherein said at least one image forming layer has an exposure time to obtain a usable Dmax of 1.5 of less than 0.01 seconds, wherein said at least one image forming layer is substantially free of image dye stabilizers, and wherein said polymer sheet has an L* of greater than 95.

Abstract: In accordance with one embodiment of the invention, a photographic element is described comprising a support bearing one or more hydrophilic colloid layers including at least one photographic silver halide emulsion layer, wherein sequestered silver ions are incorporated into at least one hydrophilic colloid layer in the form of a silver ion containing material which sequesters silver ions prior to photographic processing and releases silver ions upon exposure to photographic processing solutions. Method for preparing and processing such photographic element are also described. In accordance with particular embodiments of the invention, the silver ion containing material comprises a silver ion-exchanged zeolite material or an intercalation composition comprising a layered host material having silver ions inserted as guest ions between the layers of the host material.

Abstract: A silver halide photographic light-sensitive material is disclosed, including at least one silver halide emulsion layer, wherein the silver halide grain contained in the emulsion layer is silver chloroiodide or silver chloroiodobromide having a silver chloride content of 90 mol % or more and a silver iodide content of 0.01 to 1.0 mol %, at least one hexacyano complex is doped in an amount of at least 1×10−7 mol % based on the total silver amount, and the emulsion layer contains a methine dye represented by the formula (I) as defined.

Abstract: A silver salt photohermographic material is disclosed, comprising a support having provided thereon a light-sensitive layer containing light-sensitive silver halide, a light-insensitive organic silver salt and a binder, wherein the photohermographic material exhibits a gradation of 2.0 to 5.0 within the density region of 0.5 and 2.0 on a photographic characteristic curve obtained when the photothermographic material is subjected to exposure of 50 &mgr;J/cm2 and thermal development at 124° C. for 16 sec.; the light-sensitive layer comprises lower and upper layers and a glass transition temperature of a binder contained in the lower layer being higher than that of a binder contained in the upper layer.

Abstract: Disclosed is a silver halide photographic light-sensitive material comprising at least one silver halide emulsion layer on a support, which contains at least one organic gold compound and has a characteristic curve drawn in orthogonal coordinates of logarithm of light exposure (x-axis) and optical density (y-axis) using equal unit lengths for the both axes, on which gamma is 5.0 or more for the optical density range of 0.3-3.0. This silver halide photographic light-sensitive material provides high contrast and high sensitivity.

Abstract: A silver halide emulsion chemically sensitized by at least one compound having a bond of anionic chalcogenide to gold(I) cation and capable of releasing a gold-chalcogen anion species and a method for chemically sensitizing a silver halide emulsion, comprising adding at least one compound having a bond of anionic chalcogenide to gold(I) cation and capable of releasing a gold-chalcogen anion species are disclosed.

Abstract: A system has been disclosed for use in radiographic industrial non-destructive testing materials and personal monitoring, making use therefor, of tabular silver brom(oiod)ide emulsion grains having {111} major faces, an average equivalent circular diameter of at least 0.5 &mgr;m and an average thickness of less than 0.30 &mgr;m, having been chemically sensitized by the steps of adding at least a gold salt in order to provide the surface of said tabular grains with at least 6000 atoms of gold per &mgr;m2 of its grain surface and per (0.1 &mgr;m of thickness)2; and at least a sulfite salt in such an amount that the ratio of the number of gold atoms per &mgr;m2 and (concentration of said sulfite salt, expressed in mmole per mole of silver)2 is at least 200000.

Abstract: Photothermographic imaging materials having increased photospeed are provided by certain selenium chemical sensitizers that are added during the formulation of a photothermographic emulsion. These selenium chemical sensitizers can be used alone or in combination with other sulfur, tellurium, or gold chemical sensitizers as well as with oxidatively decomposed sulfur-containing compounds.

Abstract: In accordance with one embodiment of the invention, a photographic element is described comprising a support bearing one or more hydrophilic colloid layers including at least one photographic silver halide emulsion layer, wherein sequestered silver ions are incorporated into at least one hydrophilic colloid layer in the form of a silver ion containing material which sequesters silver ions prior to photographic processing and releases silver ions upon exposure to photographic processing solutions. Method for preparing and processing such photographic element are also described. In accordance with particular embodiments of the invention, the silver ion containing material comprises a silver ion-exchanged zeolite material or an intercalation composition comprising a layered host material having silver ions inserted as guest ions between the layers of the host material.

Abstract: A radiographic silver halide film material and a radiographic screen/film combination has been disclosed, said material having in at least one light-sensitive layer thereof an emulsion comprising {111} tabular silver halide grains rich in silver bromide, spectrally sensitive to irradiation in the wavelength range between 540 and 555 nm by the presence of a combination of at least one J-aggregating spectrally sensitizing cyanine dye according to the formula (I) and of at least one additional cyanine dye providing a shift of maximum absorption wavelength of said combination of less than 10 nm versus in the absence thereof, wherein said additional cyanine dye is at least one monomethine cyanine dye according to the formula (II), essentially having a solubilizing group or a latent solubilizing group, said dyes having been given in the description and in the claims of the present invention.

Abstract: A fluorocompound denoted by general formula (1) below (wherein R1 denotes a substituted or unsubstituted alkyl group having a total of at least six carbon atoms, with R1 not being an alkyl group substituted with a fluorine atom; Rf denotes a perfluoroalkyl group having not more than six carbon atoms; either X1 or X2 denotes a hydrogen atom and the other denotes SO3M; M denotes a cation; and n denotes an integer of not less than 1) was disclosed. A silver halide photographic light-sensitive material having at least one layer comprising a light-sensitive silver halide emulsion layer on a support and comprising a compound denoted by general formula (1) above was also disclosed.

Abstract: The present invention provides a silver halide photographic light-sensitive material comprising a support having thereon at least one silver halide emulsion layer, wherein the silver halide emulsion contained in the silver halide emulsion layer comprises silver halide grains having a silver chloride content of 90 mol % or more, and the silver halide emulsion further contains a metal complex having H2O as a ligand. It also provides a silver halide photographic light-sensitive material comprising a support having thereon at least one silver halide emulsion layer, wherein the silver halide emulsion contained in the silver halide emulsion layer contains a metal complex having O2− as a ligand.

Abstract: A silver halide emulsion is disclosed, comprising at least one monovalent Au(I) complex coordinated with a compound represented by the following formula (1):

Abstract: High-speed black-and-white photothermographic emulsions and materials comprise chemically sensitized photosensitive silver halide grains, at least 70% of the total photosensitive silver halide projected area being provided by tabular silver halide grains comprising at least 70 mole % bromide (based on total silver halide). The tabular grains have an average thickness of at least 0.02 &mgr;m and up to and including 0.10 &mgr;m, an equivalent circular diameter of at least 0.5 &mgr;m and up to and including 8 &mgr;m, and an aspect ratio of at least 5:1. These high-speed materials can be imaged in any suitable fashion using ultraviolet, visible, infrared, or X-radiation. In one embodiment, they have one or more thermally developable layers on both sides of the support and can be imaged using X-radiation with or without a phosphor intensifying screen in an imaging assembly.

Abstract: The present invention provides a silver halide emulsion containing silver halide particles, wherein a content of silver chloride in the silver halide particles is at least 89 mol %, and wherein the silver halide particles comprising at least one of (i) at least one phase selected from the group consisting of a laminar phase containing silver bromide, a laminar phase comprising silver iodide and a phase comprising silver bromide and having a maximum point where a silver bromide content ratio is at a maximum value, which maximum point is inside the silver particles, and (ii) a phase comprising silver iodide and a phase comprising silver bromide, which phase comprising silver bromide is disposed further inside of the silver halide particles than the phase comprising silver iodide. Further, the present invention provides a silver halide photosensitive material comprising the silver halide emulsion.

Abstract: Aqueous-based photothermographic materials that are sensitive to visible or X-radiation contain X-radiation sensitive phosphors in association with specific chemically sensitized tabular silver halide grains. The silver halide grains comprise at least 70 mol % bromide, based on total silver halide, have an average thickness of at least 0.02 &mgr;m and up to and including 0.10 &mgr;m, an equivalent circular diameter (ECD) of at least 0.5 &mgr;m and up to and including 8 &mgr;m, and an aspect ratio of at least 5:1. These materials can be imaged in any suitable fashion but preferably they have one or more photothermographic layers on both sides of the support and can be imaged using X-radiation with or without an associated phosphor intensifying screen.

Abstract: A silver halide emulsion comprising at least one gold-containing compound represented by composition formula (1): [Au(0)Lm]Xn  (1) wherein Au(0) is an Au atom having a valence of zero, L is a compound having at least one group capable of being adsorbed to or coordinating with Au(0), m is a value of 0 or more including decimals, X is an ion required for neutralizing electric charge of the compound, and n is a value of 0 or more including decimals.

Abstract: A silver halide color photographic light-sensitive material, which has at least one blue-sensitive silver halide emulsion layer containing a yellow coupler, at least one green-sensitive silver halide emulsion layer containing a magenta coupler, and at least one red-sensitive silver halide emulsion layer containing a cyan coupler, provided on a support, wherein at least one layer of said light-sensitive silver halide emulsion layers contains a silver halide emulsion comprising silver halide grains having a silver chloride content of 95 mol % or more, and wherein, with respect to each of characteristic curves obtained by a color development of said light-sensitive material after exposure, a specific relationship as defined by the density and the exposure amount is satisfied.

Abstract: A radiation-sensitive emulsion comprised of silver halide grains (a) containing greater than 50 mole percent chloride, based on silver, (b) having greater than 50 percent of their surface area provided by {100} crystal faces, and (c) having a central portion accounting for up to 99 percent of total silver and containing (i) a first dopant comprising an iridium coordination complex containing at least one thiazole ligand and (ii) a second dopant comprising an iridium coordination complex containing at least one substituted thiazole ligand. The combined use of first and second iridium dopants in accordance with the invention provides enhanced toe contrast softening, and can also result in improved latent image keeping stability relative to that expected from the individual effects of such dopants.

Abstract: A silver halide emulsion is disclosed, comprising tabular silver halide grains having an average iodide content of 3 to 15 mol % and comprising silver halide phases differing in halide composition, at least 50% of the total projected area of the tabular silver halide grains being accounted for by grains having an aspect ratio of not less than 12, wherein the first silver halide phase (A) has an average iodide content of not more than 3 mol % and accounting for 50 to 85% of total silver, the second phase (B) locating outside the phase (A), having an average iodide content of 8 to 25 mol % and accounting for 10 to 35% of total silver, and the third outermost phase having an average iodide content of not more than 4 mol % 0.5 to 15% of total silver.

Abstract: Disclosed is a method for chemical sensitization of a silver halide emulsion comprising a sensitization step of subjecting the silver halide emulsion to chemical sensitization with a chalcogen compound or a chalcogen compound and a gold compound to produce silver chalcogenide or gold silver chalcogenide, wherein the chemical sensitization is performed under such conditions that at least a part of the silver chalcogenide or gold silver chalcogenide produced in the sensitization step can be amorphized. This method can provide a silver halide emulsion showing high sensitivity without increasing fog and degrading storability and such a silver halide emulsion.

Abstract: A silver halide photographic emulsion in which tabular grains each having an equivalent-circle diameter of 0.6 &mgr;m or more, a thickness of 0.3 &mgr;m or less, and an aspect ratio of 2 or more account for 70% or more in number of all the grains contained therein, wherein each of the tabular grains has a multilayered structure including two or more layers, at least one of the layers contains 1 to 20 mol % of a chloride with respect to the silver amount contained in the at least one of the layers, and each of the tabular grains contains a metal complex represented by formula (C-1) or (C-2) below: [M1(CN)6-aLa]n  (C-1) [M2(CN)4-bLb]m  (C-2) wherein M1 represents Fe, Ru, Re, Os, Ir, or Pt; M2 represents Pt or Au; L represents a ligand except for CN; a represents 0, 1, or 2; b represents 0, 1, or 2; n represents 2-, 3-, or 4-; and m represents 1- or 2-.