Metal complexes of 1,10-Phenanthroline derivatives. III. Complexes of 1,10-Phenanthroline-2-amidoxime

Abstract

Complexes of 1,l0-phenanthroline-2-amidoxime with iron, cobalt, nickel, and copper salts are described. Bis-ligand, six-covalent complexes were obtained with all metals. The iron(11) complex is spin-paired while the cobalt(11) and nickel(11) complexes are spin-free. Two series of mono-ligand complexes were obtained with copper(11). One of these consists of green, paramagnetic complexes of the uncharged ligand, and the other of brown, diamagnetic complexes of the deprotonated ligand. Salts of the two series are readily interconvertible. A binuclear structure is proposed for the cation in both series. Deprotonation of the bis-ligand cobalt(11) complex is accompanied by oxidation and cobalt(111) complexes of both the uncharged and the deprotonated ligand were obtained.