Dye compounds and photographic elements containing such dyes

A silver halide photographic element comprising a negative working silver halide emulsion the grains of which :form latent images primarily on the surface, the emulsion being sensitized with a sensitizing dye of the formula:

• ##STR131## wherein:
• X.sub.1 and X.sub.2 independently represent the atoms necessary to complete a benzothiazole nucleus, benzoxazole nucleus, benzotellurazole nucleus, quinoline nucleus, or benzimidazole nucleus in which X.sub.1 may be further substituted and X.sub.2 may be substituted or unsubstituted;
• n is a positive integer from 1 to 4,
• each L independently represents a substituted or unsubstituted methine group,
• R.sub.1 and R.sub.2 each independently represents a substituted aryl or substituted aliphatic group, both of R.sub.1 and R.sub.2 being substituted with an acid or acid salt group;
• Z.sub.1 represents Ar1-(L1).sub.m, where Ar1 is a substituted or unsubstituted aromatic group, L1 is a linking group of no more than 2 atoms in sequence linking Ar1 with Z.sub.1, m is 0 or 1, and the LOGP(A) of a molecule having a structure A corresponding to a portion of the dye ##STR132## is no more than 80% of LOGP(A'), where A' is the same as A except Z.sub.1 is replaced with unsubstituted phenyl, provided that L1 is not --CO-- if X.sub.1 or X.sub.2 is S or Se;
• and
• W1 is a counterion as needed to balance the charge of the molecule.

A silver halide photographic element comprising a negative working silver halide emulsion the grains of which form latent images primarily on the surface, the silver halide emulsion sensitized with a sensitizing dye of the formula:

• ##STR134## wherein:
• Q1 and Q2 independently represent O, N, or S;
• n is a positive integer from 1 to 4;
• each L independently represents a substituted or unsubstituted methine group;
• R.sub.1 and R.sub.2 each independently represents a substituted or unsubstituted aryl or substituted or unsubstituted aliphatic group;
• Z.sub.1 represents [Ar1-(L1)m]Ar1-(L1).sub.m, where Ar1 is a substituted or unsubstituted aromatic group, L1 is a linking group of no more than 2 atoms in sequence linking Ar1 with Z.sub.1, m is 0 or 1, and the LOGP(A) of a molecule having a structure A corresponding to a portion of the dye ##STR135## is no more than 80% of LOGP(A'), where A' is the same as A except Z.sub.1 is replaced with unsubstituted phenyl, provided that L1 is not --CO-- if Q1 or Q2 is S;
• and
• the benzene rings are optionally further substituted with non-aromatic substituents;
• W1 is a counterion as needed to balance the charge of the molecule.