Photochemical synthesis of metal carbonyl complexes of tetraalkyldiphosphine disulfides, [M2(CO)10(µ-R2P(S)P(S)R2)] (M = Mo, W; R = Me, Et, n-Pr, n-Bu)

The new complexes [M2(CO)10(µ-R2P(S)P(S)R2)] (M=Mo, W; R=Me, Et, n-Pr, n-Bu), (la)7(1d) and (2a)7(2d) [(1a), M=Mo, R=Me; (1b), M=Mo, R=Et; (1c), M=Mo, R=n-Pr; (1d), M=Mo, R=n-Bu; (2a), M=W, R=Me; (2b), M=W, R=Et; (2c), M=W, R=n-Pr; (2d), M=W, R=n-Bu] have been prepared by the photochemical reaction of M(CO)6 with R2P(S)P(S)R2 (R=Me, Et, n-Pr, n-Bu). The complexes have been characterized by elemental analyses, FT-IR and 31P-[1H]-NMR spectroscopy and FAB-mass spectrometry. The spectroscopic studies suggest cis-bridging bidentate coordination of the ligand between the two metals.