Dye compound and photographic element containing same
AssigneeEastman Kodak Company
InventorsLal C. Vishwakarma, Thomas R. Dobles
Life of this patent
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Abstract
A novel red-sensitizing dye compound has a structure which contains a pentamethine oxonol chromophore linked to one or two cyanine chromophores. A photographic element comprises a support upon which is coated a silver halide emulsion layer comprising cubic silver halide crystals and said red-sensitizing dye compound.
Claims7
A photographic element comprising a support having thereon a silver halide emulsion layer comprising cubic silver halide crystals and a dye of the general formula (I) or (II) ##STR5## wherein Z.sub.1, Z.sub.2, Z.sub.3 and Z.sub.4 each independently represent the non-metallic atoms necessary to complete a substituted or unsubstituted heterocyclic ring system containing at least one 5- or 6- membered heterocyclic nucleus;
- R and R.sub.1 each represent a substituted or unsubstituted alkyl group of 1 to 10 carbon atoms, or a substituted or unsubstituted aryl, aralkyl, or cycloalkyl group of 5 to 12 carbon atoms;
- L.sub.1 independently represents an unsubstituted or alkylsubstituted methine group;
- L.sub.2 represents a linking group of 4 to 20 atoms containing at least two alkylene groups and at least one ester group, amide group, or carbamate group;
- M.sup.+ represents a cation;
- and X.sup.- represents an anion or an anionic group bonded to the compound.
Dependencies are inferred from the claim text.