Author(s)

Fikre Elemo, Tesfay Gebretsadik, Mamo Gebrezgiabher, Yosef Bayeh, Madhu Thomas^*

Department of Industrial Chemistry, Addis Ababa Science and Technology University, Addis Ababa, Ethiopia.

A comparative thermal decomposition kinetic investigation on Fe(III) complexes of a antipyrine Schiff base ligand, 1,2-Bis(imino-4’-antipyrinyl)ethane (GA)), with varying counter anions viz. CIO₄^-, NO₃^-, SCN^-, Cl^-, and Br^-, has been done by thermogravimetric analysis by using Coats-Redfern equation. The kinetic parameters like activation energy (E), pre-exponential factor (A) and entropy of activation (ΔS) were quantified. On comparing the various kinetic parameters, lower activation energy was observed in second stage as compared to first thermal decomposition stage. The same trend has been observed for pre-exponential factor (A) and entropy of activation (ΔS). The present results show that the starting materials having higher activation energy (E), are more stable than the intermediate products, however; the intermediate products possess well-ordered chemical structure due to their highly negative entropy of activation (ΔS) values. The present investigation proves that the counter anions play an important role on the thermal decomposition kinetics of the complexes.

Iron(III) Complexes, 1, 2-Bis(Imino-4’-Antipyrinyl)Ethane, Thermal Decomposition, Kinetics

Elemo, F. , Gebretsadik, T. , Gebrezgiabher, M. , Bayeh, Y. and Thomas, M. (2019) Kinetics on Thermal Decomposition of Iron(III) Complexes of 1,2-Bis(Imino-4’-Antipyrinyl)Ethane with Varying Counter Anions. Advances in Chemical Engineering and Science, 9, 1-10. doi: 10.4236/aces.2019.91001.