Sodium perborate mediated oxidation kinetics and mechanism of aniline and its substituents catalysed by Iron(III) phthalocyanine chloride

The present study is focused on the investigation of aniline and its substituents oxidation facilitated by sodium perborate in diluted acetic acid. The oxidation reaction follows first and second order with respect to sodium perborate (oxidant) and aniline (substrate) respectively. The rate of the reaction has been accelerated by enhancing the catalyst concentration. The oxidative reaction mechanism seemed to be a polar ionic mechanism with respect to the solvent. The product of the oxidation reaction was found to be azobenzene which was characterised using ultraviolet spectroscopy. The changes in the thermodynamic parameters such as activation entropy (Delta S-#), activation enthalpy (Delta H-#), free energy (DG(#)), and activation energy (E-a) were computed for ortho-, meta-, and para-substituted anilines. The mechanism for the oxidative reaction has also been proposed along with isokinetic temperature. (C) 2021 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the International Web Conference on Advanced Materials Science and Engineering.