Kinetic analysis of thermal decomposition of some Co-complexes of three unsymmetrical vic-dioximes ligands


Sahin Ö. , Tas E., Dolas H.

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, vol.89, no.1, pp.123-131, 2007 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 89 Issue: 1
  • Publication Date: 2007
  • Doi Number: 10.1007/s10973-005-7019-7
  • Title of Journal : JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
  • Page Numbers: pp.123-131
  • Keywords: Arrhenius parameter, Co(II) complexes, kinetic analysis, model-fitting and model-free methods, vic-dioxime

Abstract

The thermal decomposition of three new reagent cyclohexylamine-p-tolylglyoxime (L1H2), tertiarybutyl amine-p-tolylglyoxime (L2H2) and secondary butylamine-p-tolylglyoxime (L3H2 and their Co-complexes were studied by both isothermal and nonisothermal methods. As expected, the complex structure of Co-complexes, different steps with different activation energies were realized in decomposition process. Model-fitting and model-free kinetic approaches were applied to nonisothermal and isothermal data. The kinetic triplet (f(alpha), A and E) related to nonisothermal model-fitting method can not be meaningfully compared with values obtained from isothermal method. The complex nature of the multi-step process of the studied compounds was more easily revealed using a wider temperature range in nonisothermal isoconversional method.