THE MOLECULAR-STRUCTURE OF TONE)][AG((C7H4NS)SO2CBR3)2BF4-CENTER-DOT-ME(2)CO] - A POSSIBLE MODEL FOR BROMINE ELIMINATION OF SILVER-HALIDE FOG CENTERS

The crystal and molecular structure of ulfonyl-benzothiazole)-silver(I )-tetrafluoroborate .(acetone)] solvate, [Ag{(C7H4NS)SO2CBr3}2BF4 . Me (2)CO], has been determined by single crystal x-ray analysis. The spac e group is P2(1)/c, a = 16.985(5) Angstrom, b = 10.426(3) Angstrom, c = 19.693(4) Angstrom, beta = 111.78(2)degrees, V = 3238 Angstrom(3). C helation by the 2-tribromomethylsulfonyl) benzothiazole ligand occurs through the ring nitrogen and sulfone oxygen, resulting in a distorted tetrahedral configuration around the silver atom. This complex is pro posed as part of an alternative model for fog center removal in silver halide photographic constructions, in contrast to the theory of bromi ne radical formation from tribromomethyl compounds. Compounds containi ng tribromomethyl groups, which also possess sites capable of coordina ting with a silver halide surface, may act as ligands to position the bromine on the silver halide surface. This placement of the bromine ne ar the fog centers is suggested as a route to enhance the efficiency o f this class of compounds as antifoggants.