Disclosed is a photographic element containing a light sensitive silver halide emulsion layer having associated therewith a coupler represented by Formula I:
wherein
COUP is a coupler parent group capable of reacting with an oxidized developer to form a first dye and is bonded at a coupling position to the group
wherein X is O or NSO2R; R is an alkyl or aryl group; and DYE is a releasable second dye that is after release the same color as the first dye and is linked to OC=X by a moiety of the DYE having Formula (IA):
wherein R2 is a substituent;
provided there is contained in the coupler of Formula I at least one group of Formula IB:
wherein L is a divalent linking group and m is 0 or 1; and Sol is a group containing an acidic hydrogen selected from the group consisting of -ArOH, -NHSO2R1 and -SO2NHR1, in which Ar is an aromatic group and each R1 is a substituent;
provided further that the pKa of an acidic hydrogen of Sol is less than 8.8.
本发明公开了一种照相元件,该元件含有感光卤化
银乳剂层,并与式 I 所表示的耦合剂相关联:
其中
CO
UP是耦合剂母基,能与氧化显影剂反应形成第一
染料,并在耦合位置与基团键合
其中 X 是 O 或 NSO2R;R 是烷基或芳基;DYE 是可释放的第二
染料,释放后颜色与第一
染料相同,并通过具有式 (IA) 的 DYE 分子与 OC=X 连接:
其中 R2 是取代基;
只要式 I 的耦合剂中含有至少一个式 IB 的基团:
其中 L 是二价连接基团,m 是 0 或 1;Sol 是含有酸性氢的基团,该基团选自由-ArOH、-NHSO2R1 和-SO2NHR1 组成的组,其中 Ar 是芳香基团,每个 R1 是取代基;
此外,Sol 的酸性氢的 pKa 小于 8.8。