Patent ID: 7138224

Claim:
A photothermographic material comprising a support having on one side of the support a photosensitive layer comprising: photosensitive silver halide grains; and a compound represented by Formula (3) or Formula (4): wherein R 11 and R 12 are each independently a hydrogen atom or a substituent; Z 11 is O, S, N—R 1 , Se or Te, provided that R 1 is an alkyl group or an aryl group; A 11 and A 12 are each independently a substituent, provided that A 11 and A 12 are different groups from each other, Z 32 O, S, N—R 3 , Se or Te, provided that R 3 is an alkyl group or an aryl group; and A 33 and A 34 are each independently a hydrogen atom or a substituent, wherein R 21 and R 22 are each independently a hydrogen atom or a substituent; Z 21 is O, S, N—R 2 , Se or Te, provided that R 2 is an alkyl group or an aryl group; A 21 and A 22 are each independently a substituent, provided that A 21 and A 22 are different groups from each other; B 21 is an alkyl group or an aryl group; X 21 is an ion which compensate an electric charge of the molecule; and n is 0 or 1, provided that n is 0 when the molecule forms an inner salt; Z 4 , is O, S, N—R 4 , Se or Te, provided that R 4 is an alkyl group or an aryl group; and A 43 and A 44 are each independently a hydrogen atom or a substituent.