Thermal Decomposition Kinetics of Nano-Sized Chromium(III) Carboxylates

B.P. Baranwal*, T. Fatma and A. Varma

Department of Chemistry, Coordination Chemistry Research Laboratory, Deen Dayal Upadhaya Gorakhpur University, Gorakhpur-273 009, India Tel: (91)(551)2203459; E-mail: drbpbaranwal@gmail.com; drbpbaranwal@yahoo.com

Abstract

The kinetics of thermal decomposition of a few nano-sized trinuclear oxo-centered, carboxylato bridged chromium(III) complexes has been reported on the basis of TG, DSC and DTG studies. It is found that the decomposition occurs in two steps. Following the experimental results a thermal decomposition scheme along with thermal stability order of the complexes under investigation is proposed. The kinetic parameters like activation energy (Ea), pre-exponential factor (A) and activation entropy (DS#) have been evaluated for each step. Powder XRD data were used to find out the particle size of the complexes which indicated them to be of nano-size.

Keywords

Activation energy, Carboxylate complexes, Chromium(III), Nano-size, Oxocentered, TG-DTG-DSC.

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  • Asian J. Chem. /
  •  2010 /
  •  22(8) /
  •  pp 5865-5870