In situ spectroscopic evidence for facile, carbon monoxide mediated, reversible cleavage of neutral heterobimetallic rhodium–ruthenium complexes into ionic mononuclear complexes
Abstract
In situ IR and NMR spectroscopic evidence is presented for facile and reversible cleavage of ligand-bridged metal-metal bond sin heterobimetallic Rh-Ru complexes of the type [(C5R5)Ru(µ-CO)2(µ-LL)RhX2][R = H, LL = Ph2PCH2(dppm), Me2PCH2Pme2(dmpm) or Ph2PC(CH2PPh2(dppee); X = Cl, I] upon reaction with carbon monoxide under mild conditions to form [Ru(C5R5)(CO)2(η1-LL)]+ and [RhX2(CO)2]–; an intermediate species in the cleavage process, [C5H5)(CO)2Ru(µ-Me2PCH2PMe2) Rh(CO)Cl2], is detected by NMR spectroscopy.