Benjamin G. Ellis

A novel methodology for the synthesis of complexes containing long carbon chains linking metal centres: molecular structures of {Ru(dppe)Cp*}2(μ-C14) and {Co3(μ-dppm)(CO)7}2(μ3:μ3-C16)

Elimination of AuX(PR3)(X = halogen, R = Ph, tol) occurs readily in reactions between compounds containing C(sp)- or C(sp2)-X bonds and alkynyl or polyynyl gold(I) complexes; this reaction has been applied to the syntheses of complexes containing a variety of metal centres linked by C(n) chains (n up to 16).

Reactions of heterometallic tungsten–iridium and tungsten–rhodium complexes containing C4 chains

Abstract Modified syntheses of {Cp(OC)3W}CCCC{M(CO)(PPh3)2} (M=Rh, Ir) from W(CCCCH)(CO)3Cp and M(OTf)(CO)(PPh3)2 are described. The Group 9 metal centre is the most electron-rich site, readily adding MeI or C2(CN)4. Reactions with iron carbonyls give successively {Cp(OC)3W}CCC2{Fe2M(CO)8(PPh3)} and {Cp(OC)8Fe2W}C2C2{Fe2M(CO)8(PPh3)}, in which Fe2(CO)6 moieties add to a CC group and the adjacent metal centre. X-ray structures of {Cp(OC)3W}CCCC{Rh(CO)[η-C2(CN)4](PPh3)2}, {Cp(OC)3W}CCC2{Fe2Rh(CO)8(PPh3)} and {Cp(OC)8Fe2W}C2C2{Fe2Ir(CO)8(PPh3)} have been determined.

Two Tetracobalt Cluster Complexes: Preparation and Molecular Structures of Co4(μ-dppm)2(μ-CO)3(CO)5 and CO4(μ-CO)3(CO)6(η-C6H6)

The crystal and molecular structures of the title complexes (1) and (2) are described. Each contains a Co4 tetrahedron, one face of which is edge-bridged by three -CO ligands. In (1), a pair of mutually orthogonal Co–Co bonds are bridged by the two dppm (dppm = bis(diphenylphosphino)methane) ligands. The structure of the benzene complex was determined at 153 and 300 K; as with other arene–Co4 clusters, the η6-benzene ligand sits on the apical (i.e. non-CO-bridged) Co atom. Manuscript received: 25 June 2001. Final version: 20 August 2001.