| 摘要 |
Emulsion comprises Ag halide grains having at least two grain surface modifiers, the first being a transition metal complex contg. a gp VIII transition metal and the second being a transition metal complex comprising a nitrosyl or thionitrosyl ligand and a transition metal from gps. V - X. Ag halide grains are pref. Ag silver-chloride and are substantially free of iodide or bromide. Grain surface modifiers are pref. positioned at intervals on the AgCl grain surface in a Ag Br carrier which comprises less than 2 mol.%, pref. less than 1 mol.%, of the halide grain. First modifier pref. contains cyanide ligands and pref. is of formula (I), with the second modifier being of formula (II). In the formulae, M = gp VIII transition metal; L = ligand; y = 0-3; n = (-2)-(-4); T = transition metal from gps. V-X; Z = OR or S, forming nitrosyl or thionitrosyl with N; E,E1 = ligands; r = 0-(-3). |
