Spectral characterization of tetradentate Schiff base complexes of N2O2 donor groups

Copper(II) complexes of tetra dentate Schiff bases N, N’ – disalicylidene – 1, 2 – phenylenediamine(H2dsp), N, N’ – disalicylidene – 3, 4 – diaminotoluene(H2dst), 4 – nitro - N, N’ – disalicylidene – 1, 2 – phenylenediamine(H2ndsp), N, N’ – disalicylideneethylenediamine(H2salen) have been synthesized and characterized by elemental analysis, electronic spectra, IR spectra, magnetic susceptibility measurement, EPR, CV and thermal studies. TG studies show that Cu(dsp) and Cu(ndsp) complexes thermally degrade in two steps and Cu(dst) and Cu(salen) in one step. Kinetic and thermodynamic parameters were computed from thermal decomposition data. The activation energies of both the thermal degradation step lie in between 52 – 74 kJ/mol