The thermal, spectral and magnetic studies of oxamic acid compounds of cobalt(II), nickel(II) and copper(II) ions

Abstract

Cobalt, nickel and copper compounds with oxamic acid have been prepared in aqueous solution. The compounds have been characterised by analyses, magnetic moments, and vibrational and electronic spectra. They have the stoichiometry ML 2(H 2O) 2 and have octahedral structures. The thermal behaviour of these compounds has been studied by thermogravimetry and differential thermal analyses. The degradation processes for the cobalt and nickel complexes are similar, first losing two water molecules and then the organic ligand, to give the metal oxides. The copper complex loses first one water molecule, then the other water molecule and, finally, the organic ligand to give the metal oxide.