Notes. Dinuclear mono-µ-chloro-pyridyldiaza rhodium(I) complexes derived from pyridyldi-imines via hydrogen transfer from ethanol

Abstract

Reaction of [{Rh(C₂H₄)₂Cl}₂] in ethanol with some pyridyldi-imine ligands with and without olefin-containing side-chains affords dinuclear monochloro- bridged rhodium (I) complexes of the corresponding reduced pyridyldiaza ligands. The product complexes, in which the pendant olefinic groups are not co-ordinated, have been characterised by analytical and spectroscopic methods and by their separate preparation from the pre-formed pyridyldiaza ligands. A mechanism for the solvent-to-imine hydrogen transfer involving oxidative addition of EtOH at the rhodium(I) centres is proposed.