Tungsten carbonyl σ-complexes with charge-compensated nido-carboranyl thioether ligands

Abstract

Charge-compensated nido-carboranyl thioether ligands [7-MeS-10-Me₂S-7,8-C₂B₉H₁₀] and [7,8-(MeS)₂-10-Me₂S-7,8-C₂B₉H₉] were prepared and fully characterized. They readily react with labile tungsten carbonyls to give σ-complexes – mono-substituted (CO)₅W[7-MeS-10-Me₂S-7,8-C₂B₉H₁₀-κ¹-S(1)] and (CO)₅W[7,8-(MeS)₂-10-Me₂S-7,8-C₂B₉H₉-κ¹-S(1)] and chelate (CO)₄W[7,8-(MeS)₂-10-Me₂S-7,8-C₂B₉H₉-κ²-S(1),S(2)]. The synthesized metallocomplexes were characterized by multinuclear NMR spectroscopy and single crystal X-ray diffraction. The donor ability of the 7-methylsulfide-nido-carborane ligand is not sensitive to introduction of the charge-compensating dimethylsulfonium group.