| 摘要 |
<p>A photographic element is disclosed comprising a support bearing at least one photographic silver halide emulsion layer and at least one photographic coupler comprising a pyrazolotriazole moiety (PT), the coupler having the formula <CHEM> wherein PT is a pyrazolotriazole moiety, n is independently 0 or 1; Z1 is a releasing group having an oxygen, nitrogen or sulfur atom bonded to COUP; Z2 is a timing group containing an oxygen, nitrogen or sulfur atom, said timing group bonded to -C(R1)(R2)- by said oxygen, nitrogen or sulfur; R1 and R2 selected from hydrogen, or a substituent or a 5, 6, or 7-membered ring comprising R1 and R2; PUG is a photographically useful group; and COUP is a photographic coupler.</p> |
