| 摘要 |
Difunctional compounds wherein one of said functions is a hard or soft atom that ionizes to the corresponding anion in alkaline solution to combine with silver cation and the other of said functions is a non-ionizable soft base that additionally combines with said silver cation are employed as silver halide complexing agents in photography. In a preferred embodiment, the difunctional compounds possess (a) an O, N or C atom that ionizes to the corresponding O(-), N(-) or C(-) anion in basic solution and (b) an -S- containing moiety excluding -SH and moieties that form -S(-) in basic solution wherein the -S- of said moiety is positioned alpha, beta, gamma, delta, epsilon or zeta to said anion.
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