Optically active pseudoctahedral rhodium(III), iridium(III), and ruthenium(II) complexes with α-amino acidato ligands. Crystal structures of RIrSCSN- and SIrSCSN-[(C 5Me 5)Ir(pro)Cl] · [formula omitted]H 2O (Hpro = l-proline)

Abstract

The synthesis and characterization of optically active amino acidato complexes of the types [(C 5Me 5)M(aa)Cl], [( p-cymene)Ru(aa)Cl], [(C 5Me 5)M(aa)(PPh 3)]BF 4, and [( p-cymene)Ru(aa)(PPh 3)]BF 4 (M = Rh, Ir; Haa = l-alanine, l-proline), in which the metal is a chiral centre, are reported. The cationic species were prepared via the solvato-complexes [(C 5Me 5)M(aa)(MeOH)] + and [( p-cymene)Ru(aa)(MeOH)] +, which epimerize rapidly on the 1H NMR time scale. The crystal structure of the complex [(C 5Me 5)Ir(pro)Cl] is reported; the asymmetric unit contains two independent molecules differing in the configuration at the metal.