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

Article abstract of DOI:10.1016/S0277-5387(98)00066-7

The gold (I) complexes [Au₂ (S-S) (AsPh₃) ] n (S-S = S₂C₆H₄, S₂C₆H₃CH₃) react with (Ph₂P (CH₂) nPPh₂) (n = 1, dppm; 2, dppe) affording [Au₂ (S-S) (dppe) ] (1-2) or [Au₄ (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 (μ-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 tetrahydrothiophene group, [Au₂ (μ-dppm) (C₆F₅) X (S-S) ] (9, 10) . The crystal structure of [Au₂ (μ-dppm) (C₆F₅)₂(S₂C₆H ₄) ] (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.