SYNTHESES AND STRUCTURAL STUDIES OF TRIORGANOPHOSPHINEGOLD(I) MERCAPTOBENZOATE COMPLEXES

Compounds of the type R3PAu(SC6H4CO2H), R = Et, Ph or c-hexyl have been prepared and characterized by IR, H-1 and C-13 NMR and FAB MS spectroscopic techniques. The Au atom has been shown to be linearly coordinated by the R3P ligand and the S atom of the thiolate; there is no interaction between the carboxylic acid function and the Au atom. These results were verified by a crystal structure analysis of the R = c-hexyl derivative which showed the Au atom to exist in a linear geometry with Au-S 2.313 (1), Au-P 2.271(1) angstrom and S-Au-P 176.8(1)-degrees. The c-hexyl3PAu(SC6H4CO2H) compound crystallizes in the triclinic space group P1BAR, with unit cell dimensions a = 11.048(2), b = 13.752(1), c = 9.858(1) angstrom, alpha = 107.72(1), beta = 97.99(1), gamma = 111.46(1)-degrees and Z = 2. The structure has been refined to final R = 0.036 and R(w) = 0.036 for 4849 reflections with I greater-than-or-equal-to 2.5sigma(1).