| abstract |
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 formula (I), 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 trifluoroalkyl; Y is alkyl, aryl or COR wherein R is OH, NR?2 or OM+¿, wherein R2 is hydrogen, alkyl, substituted alkyl, aryl or substituted aryl; wherein M?+ is HNR3¿3+ 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. |