| 摘要 |
A photographic element having a silver halide emulsion sensitized by dye of the formula I: <IMAGE> I wherein: R1 represents a substituted or unsubstituted aromatic or heteroaromatic group, a substituted or unsubstituted alkyl or H; R2 represents a substituted or unsubstituted alkyl, alkenyl, aryl, aralkyl, or H; E1 represents an electron withdrawing group; Z represents the non-metallic atoms required to complete a substituted or unsubstituted ring system containing at least one 5- or 6-membered heterocyclic nucleus; L1, L2, L5 and L6 independently represent a substituted or unsubstituted methine; m may be 0, 1, 2 or 3; n may be 0 or 1.
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