The role of saturated transition metal carbonyl complexes as π-acid ligands; a theoretical investigation of the bonding in [Cr(µ-CO)2(CO)(η-C6H6)Rh(CO)(η-C5Me5)] and (Co)(µ-CO)2(η-C5H5)Rh(PH3)(η-C5H5)]

Abstract

E.H.M.O. Calculations on [Cr(µ-CO)₂(CO)(η-C₆H₆)Rh(CO)(η-C₅Me₅)] and [Co(µ-CO)₂(η-C₅H₅)Rh(PH₃)(η-C₅H₅)]indicate that the saturated [Cr(CO)₃(η-C₆H₆)]and [Co(CO)₂(η-C₅H₅)] moieties are excellent π-acid ligands for the electron-rich [Rh(L)(ηC₅R₅)] fragments; bonding takes place through the semi-bridging carbonyl with little net metal–metal interaction.