Kinetics and Mechanism of meso-Tetraphenylporphyrin Iron(III)‎ Chloride Catalysed Oxidation of Indole-3-Acetic Acid by Peroxomonosulphate

Abstract EN

Mechanistic study on meso-tetraphenylporphyrin iron(III) chloride (TPP) catalysed oxidation of indole-3-acetic acid by peroxomonosulphate (oxone) in aqueous acetonitrile medium has been carried out.

The reaction follows a first order with respect to both substrate and oxidant.

The order with respect to catalyst was found to be fractional.

The order of reaction with respect to catalyst varies with a concentration of catalyst.

Increase in percentage of acetonitrile decreased the rate.

The reaction fails to initiate polymerization, and a radical mechanism is ruled out.

Activation and thermodynamic parameters have been computed.

A suitable kinetic scheme based on these observations is proposed.

Significant catalytic activity is observed for the reaction system in the presence of TPP.