Optically active Co-ordination compounds. Part XXVII. Complexes of cobalt(III) with glycyl-L-histidine

Abstract

By use of anion-exchange and Sephadex chromatography, five complexes of cobalt(III) with glycyl-L-histidine have been isolated from the reaction of cobalt(II) and oxygen with the ligand. Three of the complexes are mononuclear and two are binuclear. The manner in which the ligand binds to cobalt(III) has been elucidated by use of titration curves and ¹H n.m.r. spectra. The possible geometrical isomers are considered and structural suggestions are made.