The thermal decomposition of some Cr(III) complexes

Abstract

The thermal decomposition reactions of the following chromium(III) complexes were investigated:Cr(CH3COO)3 "2 H20, [Cr30(CH3COO)6(H20)3]CI "2 H20 and [Cr30(CH2CICOO)6(H20)3]CI'6H20. Simultaneous TG/DTG/DTA were applied nonisothermal conditions. From the recorded curves, the activation energies Ea were calculated for all the thermal decomposition steps. Appropriate chemical reactions were attributed to the thermal effects, with consideration to the X-ray diffraction and IR spectra results.The coordination compounds are subject to ever increasing research by derivatography because of the various molecular structures of these compounds and the great variety of ligands and central ions, and also because of the role played by coordination compounds and their high-temperature decomposition products in catalytic processes. Application of derivatography may also provide qualitative information regarding the stability of the crystal lattice, the character of the bonding in the molecules, the mechanism of their decomposition and the kinetics of these reactions. Obviously, this research must be related with the results of other structural investigations, e.g. X-ray crystallography or spectroscopy. This work presents the results of such studies on the following compounds:Cr (CH3COO)3" 2 H20, [Cr30(CH2C1COO)6(H20)3]C1-2 H20 and [CraO(CH3COO)6(H20)3]CI" 6 H20.

Thermogravimetric investigation of thermal decomposition of copper(II) complexes with methylpyrido[2,3-d]imidazole derivatives

“…The method of Coats and Redfern was chosen [10]. The calculation procedure described in detail in [11][12][13] was used here.…”