AN INVESTIGATION OF ELECTRON-TRANSFER PROPERTIES OF (CP)MN(CO)3 AND SUBSTITUTED CP DERIVATIVES

The results of an electrochemical investigation of the reduction of (e ta5-C5H5)Mn(CO)3, (eta5-C5H4COOCH3)Mn(CO)3, (eta5-C5H4CH3)Mn(CO)3 and (eta5-C5H4Cl)Mn(CO)3 are reported. Each compound was characterized wit h at least a single one-electron EC process. However, for (eta5-C5H4CO OCH3)Mn(CO)3 and (eta5-C5H4Cl)Mn(CO)3 additional reduction processes w ere also observed. The first reduction potential of these compounds ex hibits a potential range of 340 mV and a correlation with the Hammett parameter (sigma(p)). Voltammetric and IR analysis of the reduced solu tions indicate that several species are formed upon reduction. A possi ble reaction scheme is suggested, although isolation of the proposed p roducts and intermediates for identification has not been possible.