Photographic emulsion containing transition metal complexes
AssigneeEastman Kodak Company
InventorEric L. Bell
Life of this patent
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Abstract
The present invention provides a photographic emulsion silver halide grains having incorporated therein or thereon a dopant, a grain surface modifier, and a hexacoordination complex comprising iridium, wherein the grain surface modifier is a transition metal complex comprising a nitrosyl or thionitrosyl ligand with a transition metal selected from the Groups 5 to 10, inclusive, of the periodic table, and the dopant is a transition metal complex comprising a transition metal, other than iridium, which is selected from Groups 7 to 10 of the periodic table.
Claims25
A photographic silver halide emulsion comprising silver halide grains having incorporated therein a dopant, and thereon a grain surface modifier, and further comprising a hexacoordination complex comprising iridium, wherein the grain surface modifier is a transition metal complex comprising a nitrosyl or thionitrosyl ligand with a transition metal selected from Group 8 of the periodic table, and the dopant is a transition metal complex comprising a transition metal, other than iridium, which is selected from Groups 7 to 10, inclusive, of the periodic table.
A photographic silver halide emulsion comprising an iridium containing transition metal complex and silver halide grains that are formed in the presence of a dopant, the dopant being a transition metal complex and comprising a cyanide ligand and a transition metal selected from Group 8 of the periodic table;
- and that are modified subsequent to their formation by a grain surface modifier, the modifier being a transition metal complex comprising a transition metal selected from Group 8 of the periodic table with a nitrosyl or thionitrosyl ligand.
A photographic silver halide emulsion comprising silver halide grains having associated therewith, a grain surface modifier, a dopant, and a hexacoordination complex comprising iridium, wherein the grain surface modifier has the structure:
- [TE.sub.4 (NZ)E'].sup.r
- where
- T is a transition metal selected from the Group 8 of the periodic table;
- Z is oxygen or sulfur, and together with nitrogen forms the nitrosyl or thionitrosyl ligand;
- E and E' represent ligands;
- and
- r is zero, -1, -2, or -3;
- the dopant has the structure:
- [M(CN).sub.6-y L.sub.y ].sup.n
- where
- M is a Group 8 transition metal;
- L is a ligand;
- y is zero, 1, 2, or 3;
- and
- n is zero, -1, -2, -3, or -4;
- and the hexacoordination complex comprising iridium has the structure:
- R.sub.q IrX.sub.6
- where
- R represents a hydrogen atom, an alkali metal atom, or an ammonium radical;
- q is 2, 3 or 4;
- and
- X represents a ligand.
Dependencies are inferred from the claim text.