| 摘要 |
A photographic element is described with improved speed in the blue and ultra-violet region of the electromagnetic spectrum. The spectral response of the photographic element is enhanced with at least one dye represented by (* CHEMICAL STRUCTURE *) wherein A1 and A2 are hydrogen or taken together represent X-CH=, wherein X is hydrogen, alkyl or substituted alkyl, substituted or unsubstituted five-member heterocyclic ring, substituted or unsubstituted six-member heterocyclic ring, aryl or an aryl substituted by at least one element chosen from the group consisting of alkyl, halogen, aryl, carbonyl, alkoxy, sulfonate, carboxy or triflouralkyl; Y is alkyl, aryl or COR wherein R is OH, NR2 or OM+, wherein R2 is hydrogen, alkyl, substituted alkyl, aryl or substituted aryl; wherein M+ is HNR33+ or a metal cation, wherein R3 is hydrogen, alkyl or substituted alkyl, aryl or substituted aryl; Z is hydrogen, alkyl, substituted alkyl, aryl or substituted aryl.
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