Molecular structure of heterobimetallic µ-η2-(C,C)-ketene complexes

Abstract

Molecular structures of the first examples of heterobimetallic µ-η²-(C,C)-ketene complexes, [(OC)₂(cp)Fe(CH₂CO) Ni(cp)(CO)](1) and [(OC)₂(cp)Fe(CH₂CO) Mn(CO)₅](2)(cp =η⁵-C₅H₅,) have been determined by single-crystal X-ray diffraction studies. They comprise 1,4-dimetalla-2- butanones (M–CH₂CO–M′) with significant contribution from an oxycarbene structure [M–CH₂C-(O^–)M′⁺] and a π-complex resonance form {M⁺[CH₂C(O^–)-M]} in accord with previously reported spectroscopic studies.