Metal complexes of 1,10-phenanthroline derivatives. VI. Complexes of iron, cobalt, nickel, and copper with 1,10-Phenanthroline-2-carbothioamide or N Phenyl-1,10-phenanthroline-2-carbothioamide

Mono- and bis-ligand complexes of iron, cobalt, nickel and mono-ligand complexes of copper with the tridentate chelating agents 1,10- phenanthroline-2-carbo-thioamide and N-phenyl-1,10-phenanthroline-2- carbothioamide are described. Both ligands produce a strong field with iron(II) and the bis-ligand complexes of cobalt(II) and the former display a temperature-induced spin transition resulting in an anomalous temperature-dependence of their magnetism. In all the mono-ligand complexes the metal atom is believed to be six-coordinate. Both ligands may be deprotonated in their complexes and deprotonation of the N- phenyl derivative occurs spontaneously when it interacts with cobalt(II) or copper(II), the reaction with cobalt being accompanied by oxidation of the metal. Both ligands coordinate through the sulphur atoms of the thioamide group.