Dithiolate diphosphine polynuclear gold complexes.: X-ray structure of [Au2(μ-dppm)(C6F5)2(S2C6H4)]

The gold(I) complexes [Au-2(S-S) (AsPh3)]n (S-S = S2C6H4, S2C6H3CH3) react with (Ph2P(CH2)nPPh(2)) (n = 1, dppm; 2, dppe) affording [Au-2(S-S)(dppe)] (1-2) or [Au-4(S-S)(2)(dppm)(2)] (3, 4). The gold(III) derivative [Au(C6F5)(S-S) (AsPh3)] reacts with dppe giving rise to [{Au(C6F5)(S-S)}(2)(mu-dppe)] (5, 6) or with dppm affording [Au(C6F5)(S-S)dppm] (7, 8). Complexes 7, 8 further react with the gold(I) compounds [AuX(tht)] (X = Cl, C6F5) giving after substitution of the tetrahyrdrothiophene group, [Au-2(mu-dppm)(C6F5) X(S-S)] (9, 10). The crystal structure of [Au-2(mu-dppm)(C6F5)(2)(S2C6H4)] (10) has been established by X-ray diffraction and shows a linear Au(I) atom, bonded to a C6F5 group and a phosphorus of the dppm, which then bridges via the other phosphorus to a square planar Au(III) atom, which also carries a C6F5 group and a chelating dithiolate. (C) 1998 Elsevier Science Ltd. All rights reserved.