SYNTHESIS, CHARACTERIZATION AND THERMAL DEGRADATION STUDY OF CO(II), NI(II) AND CU(II) COMPLEXES OF HETEROCYCLIC SCHIFF BASE LIGAND

New Schiff base ligand has been synthesized by the condensation of 3-(3-chloro-6-hydroxy-2-methylphenyl)-5-(p-tolyl)-4,5-dihydro-1H-pyrazol-1-yl)(pyridin-4-yl)methanone with isoaniazide in ethanolic solution. This ligand is characterized on the basis of IR, 1H-NMR and Mass Spectra. From this ligand new Co(II), Ni(II) and Cu(II) complexes were synthesized and characterized on the basis of elemental analysis, IR spectra and Electronic Spectra. The nonelectrolytic nature for all metal complexes confirmed on the basis of molar conductivity data. The Fremann-Caroll and Sharp-Wentworth methods have been employed to study the thermal behaviour of complexes and to calculate activation energy (Ea), thermal stability, order of reaction (n), entropy change (Delta S), free energy change (Delta F). The activation energy calculated with above two mentioned methods is in close agreement. The ligand is act as tridentate and square planar geometry is suggested to all metal complexes.i-iii