Triosmium compounds containing the oxametallacycle [Os(CO)3{C(R)double bond; length as m-dashCHC(O)CHdouble bond; length as m-dashC(H)C5H4FeC5H5}] moiety. Synthesis and electrochemical studies

The compounds [Os3(CO)10{μ,η3-(SCH2CH2SCdouble bond; length as m-dashCHC(O)CHdouble bond; length as m-dashCH(C5H4)Fe (C5H5)}] (2), [Os3(CO)9{μ,η3-(SCH2CH2SCdouble bond; length as m-dashCHC(O)CHdouble bond; length as m-dashCH(C5H4)Fe(C5H5)}] (3) and [Os3(CO)8{μ3,η2-{Cdouble bond; length as m-dashCHC(O)CHdouble bond; length as m-dashCH(C5H4)Fe(C5H5)}(SCH2CH2S)}] (4) have been obtained by rupture of S–C bonds in the ketene dithioacetal [C5H5FeC5H4CHdouble bond; length as m-dashCHC(O)CHdouble bond; length as m-dashC(SCH2CH2S)], in their reaction with the activated cluster [Os3(CO)10(NCMe)2]. The presence of an oxametallacycle in these derivatives has been confirmed by an X-ray diffraction analysis. The electrochemical study has indicated the ability of these compounds to modify the electrode surfaces.