Silver halide photographic element

• Main Authors: LENHARD, JEROME R, MUENTER, ANNABEL A, ZIELINSKI, PAUL A, SHUKLA, DEEPAK, GODLESKI, STEPHEN A, DIEHL, DONALD R
• Format: Patent
• Language: English; French; German
• Published: 03.07.2002
• Edition: 7
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; AUXILIARY PROCESSES IN PHOTOGRAPHY; CHEMISTRY; CINEMATOGRAPHY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; ELECTROGRAPHY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HETEROCYCLIC COMPOUNDS; HOLOGRAPHY; METALLURGY; ORGANIC CHEMISTRY; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES; PHOTOGRAPHY; PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHYSICS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

This invention provides a photographic element comprising at least one silver halide emulsion layer in which the silver halide is sensitized with a compound of the formula (a): DELTA -(t)m-XY' XY'-(t)m - DELTA DELTA -(t)m-XY'-(t)m- DELTA wherein DELTA is protective group that is eliminated during development of the photographic element, t is a timing group, m is an integer from 0 to 3, and XY' is a fragmentable electron donor moiety in which X is an electron donor group and 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 or is covalently linked directly or indirectly to X, and wherein: 1) X-Y' has an oxidation potential between 0 and about 1.4 V; 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.