PREPARATION AND STRUCTURE OF AU2(MU-YLIDE)2[S2C6H4]2 - A DINUCLEAR GOLD(III) YLIDE COMPLEX WITH CIS,CIS GEOMETRY

The preparation and crystal structure analysis of the cis,cis geometric isomer of the 1,2-benzenedithiolate AuIIIcomplex AU2(μ-ylide)2(S2C6H4)2(1), where μ-ylide = (CH2)2P(C6H5)2, have been performed. Complex 1 crystallizes in the monoclinic space group P21/c with a = 7.635 (1) Å, b = 19.037 (3) Å, c = 13.210 (2) Å β = 96.84 (1), and Z = 2.2Refinement using 1794 eflections with F02> 3σ(F02) yielded conventional R values of R = 0.0185 and Rw= 0.0182. The AuIIImetal centers have the expected square-planar coordination and are related to each other by a crystallographic inversion center. The two phosphine ylide ligands act as bidentate bridging groups, with methylene carbon atoms occupying cis positions on the metal centers. The chelating 1,2-benzenedithiolate ligands complete the coordination sphere of the metal atoms. The cis arrangement of methylene atoms at the metal centers and the chair configuration of the eight-membered Au2C4P2ring combine to separate the two metal atoms by a distance of 4.40 Å. © 1990, American Chemical Society. All rights reserved.