名称:
In situ spectroscopic evidence for facile, carbon monoxide mediated, reversible cleavage of neutral heterobimetallic rhodium–ruthenium complexes into ionic mononuclear complexes
摘要:
In situ IR and NMR spectroscopic evidence is presented for the facile and reversible cleavage of ligand-bridged metal-metal bonds in heterobimetallic Rh-Ru complexes of the type [(C(5)R(5))Ru(mu-CO)(2)(mu-LL)RhX(2)] [R = H, Me; LL = Ph(2)PCH(2)PPh(2) (dppm), Me(2)PCH(2)PMe(2) (dmpm) or Ph(2)PC(=CH2)PPh(2) (dppee); X = Cl, I] upon reaction with carbon monoxide under mild conditions to form [Ru(C(5)R(5))(CO)(2)(eta(1)-LL)](+) and [RhX(2)(CO)(2)](-); an intermediate species in the cleavage process, [(C5H5)(CO)(2)Ru(mu-Me(2)PCH(2)PMe(2))Rh(CO)Cl-2], is detected by NMR spectroscopy.