PREPARATION, STRUCTURAL CHARACTERIZATION, THERMAL AND ELECTRICAL STUDIES OF COMPLEXES OF COBALT, NICKEL AND COPPER WITH M-TOLUIDINE

The thiocyanate complex of cobalt and the chloro complexes of cobalt, nickel and copper with m-toluidine which have been prepared in ethanolic solution have stoichiometry ML2X2. The stereochemistry of the complexes has been obtained from spectral and magnetic data. The thiocyanate complex of cobalt and the chloro complexes of nickel and copper have octahedral structures, whereas the chloro complex of cobalt has a tetrahedral structure. Thermal decomposition studies, using thermogravimetry and differential thermal analysis show that intermediate metal complexes are formed for the chloro complexes during their decomposition processes, the metal oxides being finally produced in each case. The thiocyanate complex of cobalt decomposes to give cobalt thiocyanate and finally an oxide of cobalt. The electrical measurements show that the metal complexes exhibit ohmic behaviour and that the metal ion has an important contribution to make to the conduction process.