Thermal, spectral and magnetic studies of the chloro complexes of manganese, cobalt, nickel and copper with 3-pyridinealdoxime

Abstract

Some chloro compounds of manganese, cobalt, nickel and copper with 3-pyridinealdoxime were prepared in ethanolic solution. The compounds have the stoichiometry ML 2Cl 2. Spectral and magnetic studies were used to deduce the stoichiometry. The compounds have polymeric octahedral structures. The thermal behaviour of the compounds was studied by thermogravimetry and differential thermal analysis. Thermal decomposition studies show that the cobalt, nickel and copper compounds each form an intermediate compound before decomposing to the metal halide and finally the metal oxide. The manganese compound decomposes with loss of the organic ligand to give the metal halide, followed by loss of chlorine to give the metal oxide.