Spectroscopic, thermal and kinetic studies of coordination compounds of Zn(II), Cd(II) and Hg(II) with norfloxacin

Abstract

Some metal complexes of norfloxacin (NOR) with the formula (M(NOR)2)X2� nH2 O( M= Zn(II), (X = Cl - , AcO - ,B r - and I - ), Cd(II), (X = Cl - ,N O3 - and SO4 2- ) and Hg(II) (X = Cl - ,N O 3 - and AcO - )) have been synthesised and studied using elemental analysis (CHN), electronic (UV-vis, mid infrared, mass, and 1 H-NMR spectra), TG and DTA. The thermal decomposition pro- cesses of these complexes were discussed. The Correlation coefficient, the activation energies, E*, the pre-exponential factor, A, the entropies, S*, enthalpies, H* and Gibbs free energies, G*, of the thermal decomposition reactions have been derived from thermogravimetric (TG) and differential thermogravimetric (DTG) curves. The characterization of the final products of the decomposition was achieved by IR spectra and X-ray powder diffraction (XRD). Using the Coats-Redfern and Horowitz-Metzeger methods, kinetic analysis of the thermogravimetric data is performed.