Abstract Synthesis and characterization of the alkyne complexes [Co2(CO)6(L)], [W(CO)(L)3] and [Pt(PPh3)2(L)] with L = BnSC2SBn (Bn = benzyl) are described. X-Ray diffraction studies of [W(CO)(L)3] and [Co2(CO)5(L)]2 reveal that the donor ability of the sulfide group depends on the electronic and steric situation in the particular metal complex. The specific donor strength of sulfidesubstituted alkynes in their complexes is discussed considering the IR and NMR spectroscopic data.
