Influence of intramolecular substitution reaction of square planar carbonyl rhodium (I) cationic complex on its stability

Two cis-dicahnyl rhodium complexes containing uncoordinated donors have been synthesized, and their IR and XPS data and the influence of their intramolecular substitution re-action on their stabilities have been reported. The intramolecular substitution reaction is re-versible. Under the condition of heating and without the protection of CO, the uncoordinated donors substitute the terminal carbonyls on the rhodium to form tetradentated complex. So the rhodium complex will not decompose for the drop of the terminal carbonyls and its stability is enhanced. In atmosphere of CO, it recovers to bidentate complex.