KINETICS AND MECHANISM OF THE THERMAL DECOMPOSITION OF LANTHANUM COMPLEXES OF NAPHTHOATE WITH HYDRAZINE

K. Parimala gandhi
Department of Chemistry&Nehru Institute of Engineering and Technology, Coimbatore, Tamil Nadu, India – 641105 , IN

T. Brindha
Department of Chemistry&Nehru Institute of Engineering and Technology, Coimbatore, Tamil Nadu, India – 641105 , IN

d S. Vairam
Department of Chemistry&Nehru Institute of Engineering and Technology, Coimbatore, Tamil Nadu, India – 641105 , IN

Keywords: Coats-Redfern; Kinetics; Lanthanum; Decomposition; Thermal decomposition

Abstract

The kinetics and mechanism of the thermal decomposition of naphthoate complexes of lanthanum with hydrazine have been explained by thermal analysis. In kinetic studies the major decomposition stages (stages I and II) were calculated using the Coats Redfern equation. The TG and DTA data indicated that all complexes are thermo stable up to 91.9 K. The thermal decomposition of all Ln(III) complexes was a three-stage process except lanthanum 2- hydroxy 1- naphthoic acid and La2O3 as a final product for all the complexes. The activation energies of thermal decomposition of the complexes were calculated from analysis of the TG-DTA curves using the Coats Redfern methods.

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