| 摘要 |
PURPOSE:To enhance sharpness, development performance, etc., by adding a nondiffusive coordination compound inactive in ligand exchange, having among multidentate ligands, >=1 diffusive photographically useful ligands and releasing these ligands upon being activated in ligand exchange by reduction in an alkaline state. CONSTITUTION:A coordination compound is represented by the formulaIin which Me is a transition metal; La, Lb are multidentate ligands; Lc, Ld are single dentate ligands or multidentate ligands; X1 is a photographically useful substance residue; X2 is as X1 or a ballasting group; Y is a partner ion of the complex; p is 1-3; q is 0-3, when q is 0, p is 2 or 3; r, s are 0-4; and t is 0- 6. For example, the multidentate ligands La, Lb are ethylenediamine, the single dentate ligands are water and NH3, X1 is the photographically useful dye residue; Y1 is a ballasting group, and one or more of the multiligands La, Lb release dyes upon reduction in an alkaline condition. The complex being normally inactive in ligand exchange and nondiffusive is added to a silver halide emulsion layer or its adjacent layers, thus permitting a sharp image good in developing performance to be obtained.
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