Bi- and Polynuclear Transition-Metal Carbon Tellurides.

The first examples of bi- and polynuclear tellurocarbonyl complexes were obtained from the reactions of [W(≡CTe)(CO) (Tp*)]NEt (Tp*=hydrotris(dimethylpyrazolyl)borate) with [MCl(PCy )]/TlPF (M=Cu, Au) or [Au Cl (μ-dppm)], which afford [WM(μ-CTe)(PCy )(CO) (Tp*)] (M=Cu, Au) and [WAu (μ-CTe)(μ-dppm)(CO) (Tp*)] (PF ) . In all cases it is specifically the tellurocarbonyl that assumes a bridging, but in each case distinct, role including examples of isotellurocarbonyl, semi-bridging and σ-π coordination and combinations thereof. Tetrametallic complexes bridged by C Te and C Te ligands are also described.