Halfsandwich Transition Metal Complexes with 1,2-dichalcogenolate Carboranes

Mononuclear halfsandwich transition metal complexes (Cp*M) are useful model compounds in which one hemisphere of the coordination shell is blocked by the voluminous Cp* ring. In the protected space below the Cp* ligand, one or two 1,2-dicarba-closo-dodecarborane-1,2-dichalcogenolate ligands can be accommodated, e.q. a mono-dichalcogenolate carborane halfsandwich iridium complexes Cp*Ir(E₂C₂B₁₀H₁₀)(E=S, Se)l] and bis-dichalcogenolate carborane rhenium or tungsten complexes Cp*Re(E₂C₂B₁₀H₁₀)₂(E=S, Se,Te),Li(THF)₄] Cp*W(E₂C₂B₁₀H₁₀)₂] (E=S, Se).