Thermal degradation studies of complexes of a derivative of phenhomazine (dibenzo[b,f][1 : 5]diazocine-6 : 12-dione (PHZD)) by thermoanalytical techniques

Some of the bis-complexes of a derivative of phenhomazine (dibenzo[b,f][1 : 5]diazocine-6: 12-dione; PHZD) with Ni(II), Cu(II), Co(II), Cd(II), Zn(II) and Hg(II) of the general formula M(PHZD)(2)X-2 [where X = Cl, Br and I], w ere prepared and identified. These complexes have been characterised on the basis of elemental analysis, and spectroscopic, magnetic and conductance d ata. The thermal mode of decomposition and thermal stability of these compl exes was investigated on the basis of the respective thermal curves in a st atic air atmosphere. The thermoanalytical investigations indicate that thes e complexes undergo two-step changes as temperature is raised, except for C d(II) and Hg(II) complexes, with the formation of metal oxides as end produ ct. The degradation mechanism of the complexes has also been proposed.