Abstract: A photosensitive element including a silver halide emulsion having silver halide grains containing an organic hole-trapping dopant. In a preferred embodiment the dopant is represented by formula (I): R—COOM  (I) wherein R is hydrogen, an alkyl group, an aryl group, an aralkyl group or hetero-aryl group, and M is hydrogen or any metal or organic group which can form a salt or by formula (II):  wherein: X and Y are independently selected from O, S, Se, m is 1 and n is 1 or 2, R1 and R2 are hydrogen, an alkyl group, an aryl or aralkyl group or a heteroaryl group, wherein R1 and R2 may be the same or different and may form a ring, E represents a group linked to the carbon atom by a heteroatom, having at least one free electron pair, M+ is a proton or an organic or inorganic (metal) counterion. Moreover a photosensitive element is provided where the photosensitive element can be a photoaddressable thermographic element.

Abstract: A photosensitive element comprising a silver halide emulsion having silver halide grains containing an organic hole-trapping dopant.

Abstract: A photosensitive element comprising a silver halide emulsion having silver halide grains containing an organic hole-trapping dopant.

Abstract: A photosensitive element comprising a silver halide emulsion having silver halide grains containing an organic hole-trapping dopant. In a preferred embodiment said dopant is represented by formula (I): R—COOM  (I) wherein R is hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aralkyl group or hetero-aryl group, and M is hydrogen or any metal or organic group which can form a salt or by formula (II): wherein: X and Y are independently selected from O, S, Se, m is 1 and n is 1 or 2, R1 and R2 are hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl or aralkyl group or a substituted or unsubstituted heteroaryl group, wherein R1 and R2 may be the same or different and may form a ring, E represents a group linked to the carbon atom by a heteroatom, having at least one free electron pair, M+ is a proton or an organic or inorganic (metal) counterion.

Abstract: A photosensitive element is disclosed comprising on at least one side of a support one or more silver halide emulsion layers and a non-light sensitive hydrophilic colloidal layer characterized in that at least one emulsion layer comprises silver halide crystals having an oligomeric platinum complex containing only carbonyl ligands, which is represented by formula (1):[Pt.sub.3 (CO).sub.6 ].sub.n.sup.2- (1)wherein n is not more than 10.The invention also provides a method for the preparation of a photosensitive element as described hereinbefore comprising the step of introducing the oligomeric platinum carbonyl containing complex as represented by formula (1) during grain formation in at least one silver halide emulsion.

Abstract: Mono- or multi-metal microaggregates in a monodisperse phase in a solid or liquid medium and of a size uniformly less than 5 nm. The microaggregates are obtained by irradiation of a metal salt or a mixture of salts, by means of an ionizing radiation source, comprising dissolving a metal salt or a mixture of metal salts, in an appropriate solvent, in the presence of an oxidizing radical scavenger, and a surfactant, a support or both a surfactant and a support, and then carrying out irradiation. The metal microaggregates are useful for catalysis of various reactions, in particular, the photoreduction of water.

Abstract: The invention relates to metal microaggregates.The monodisperse of the invention are non-noble metal microaggregates in a monodispersed form in a solid or liquid medium and of a size uniformly less than 5 nm. They are obtained by irradiation of a metal salt or a mixture of salts, by means of an ionizing radiation source, by dissolving a non-noble metal salt or a mixture of metal salts, at least one of which is a non-noble metal, in an appropriate solvent, in the presence of an oxidizing radical scavenger and a surfactant and/or a support, and then by carrying out irradiation.Application is for catalysis of various reactions, in particular the photoreduction of water into hydrogen.