Abstract
The complexing behaviour of novel di(3,5-dichlorophenyl)carbazone (D3,5DClPC) towards cobalt(II), nickel(II) and zinc(II) ions has been examined by elemental analyses, magnetic moment measurements, UV-Vis., IR and 1H NMR spectral studies. D3,5DClPC behaves as a bidentate neutral ligand coordinating through the ketonic oxygen and azo nitrogen. It has been observed that the ligand and its complexes are toxic towards bacteria and fungi. The interpretation, mathematical analyses and evaluation of kinetic parameters of the thermoanalytical data (TG and DTA) are presented in this communication. The energy of activation for the two clear-cut steps of decomposition for all the complexes are compared by employing the Freeman-Carroll equation, the integration method using the Coats-Redfern equation and an approximation method using the Horowitz-Metzger equation. The Coats Red-fern equation was extended to evaluate other kinetic parameters such as the pre-exponential factor and entropy of activation.
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