Abstract

THERMAL STUDIES OF SOME TRANSITION METAL COMPLEXES OF NITRO DERIVATIVE OF PHENYLAZO-ETHYLACETOACETATE

Dr. Harmeet Kaur Kohli*

ABSTRACT

This paper is a continuation of the research work on nitrophenylazoethylacetoacetate complexes and particularly emphasizes the structural characterization of the complexes by thermal analysis (TG and DTA). Thermal analysis shows not only the structural changes of the complexes during thermal treatment, but also the mode of coordination as well as geometry of the coordination sphere of complexes, the structure of which had not been determined by X-ray analysis. Nitrophenylazoethylacetoacetate complexes of the type M(NO2-PAEA)n, where M is ZrO(IV), Th(IV), Zn(II) and Cd(II), n is the valency of the metal, and NO2-HPAEA is nitrophenylazoethylacetoacetate, have been studied thermally. The object of the study is to investigate water of hydration, coordinated water and thermal stability of the complexes by Thermogravimetry (TG) and Differential thermal analysis (DTA). Also parameters like activation energy of decomposition reaction and order of reaction are calculated by use of Freeman Carroll’s equation.

Keywords: Thermogravimetric analysis (TGA), Entropy change, Order of the reaction, Freeman-Carroll method.