Photochemical reactions of M(CO)(6) (M = Cr, Mo, W) with Ph2P(S)P(S)Ph-2

New complexes {M(CO)(4)[Ph2P(S)P(S)Ph-2]} (M = Cr, Mo and W), (1a)-(3a), [(1a), M = Cr; (2a), M = Mo; (3a), M = W] and {M-2(CO)(10)[mu-Ph2P(S)P(S)Ph-2]} (M = Cr, Mo, W), [(1b)-(3b) [(1b), M = Cr; (2b), M = Mo; (3b), M = W] have been prepared by the photochemical reaction of M(CO)(6) with Ph2P(S)P(S) Ph-2 and characterized by elemental analyses, f.t.-i.r. and P-31-(H-1)-n.m.r. spectroscopy and by FAB-mass spectrometry. The spectra suggest cis-chelate bidentate coordination of the ligand in {M(CO)(4)[Ph2P(S)P(S)Ph-2]} and cis-bridging bidentate coordination of the ligand between two metals in (M = Cr, Mo and W).