Dinuclear μ-Sulfido Complexes of Molybdenum with (Dimethylamino)ethyl-Substituted Cyclopentadienyl Ligands

The cyclopentadienyl ligand with the (dimethylamino)ethyl substituent has been used in the synthesis of the dinuclear μ-sulfido molybdenum complex (Me 2 NCH 2 CH 2 CpMo(μ-S)) 2 S 2 CH 2, 4, and related derivatives. Complex 4 has been isolated and characterized by spectroscopic methods as well as by an X-ray diffraction study. The structure confirms a bis(μ-sulfido) derivative in which the dimethylamino substitutents of the Cp ligands are directed away from the Mo 2 S 4 core. Protonation of 4 produces the dicationic complex with dimethylammonium substitutents, which is soluble in water and other polar solvents. Reaction of 4 with [CuOTf] 2 ·C 6 H 6 leads to the formation of a copper adduct [(Me 2 NCH 2 CH 2 CpMo(μ-S)) 2 Cu(S 2 CH 2 )]OTF, 6a . NMR studies of 6a in CD 2 Cl 2 suggest that the copper ion is stabilized by two sulfido ligands and by weakly coordinated dimethylamino groups.