| 摘要 |
This invention comprises a photographic element comprising at least one light-sensitive silver halide emulsion layer containing a fragmentable electron donating compound of the formula: X-Y' or a compound which contains a moiety of the formula -X-Y'; wherein X is an electron donor moiety, Y' is a leaving proton H or a leaving group Y, with the proviso that if Y' is a proton, a base, beta-, is present in the emulsion layer, and wherein: 1) X-Y' has an oxidation potential between 0 and about 1.4 V; and 2) the oxidized form of X-Y' undergoes a bond cleavage reaction to give the radical X. and the leaving fragment Y'; and 3) the radical X. has an oxidation potential >-0.7V; said photographic element further comprising a reductone of the Formula 2: wherein R23 and R24 are the same or different, and may represent H, alkyl, cycloalkyl, aryl, or an alkyl group with a solubilizing group such as -OH, sulfonamide, sulfamoyl, or carbamoyl, or R23 and R24 may be joined to complete a heterocyclic ring, R21 and R22 are H, OH, alkyl, aryl, cycloalkyl, or may together represent an alkylidene group, n is 1 or 2 and R20 is H, alkyl, aryl, or CO2R25 where R25 is alkyl. In a preferred embodiment of the invention, the photographic element is a multicolor photographic element.
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