Oxidation of 4-Methylthio phenyl acetic acid in aqueous acidic medium by Cr (VI): Kinetic and Mechanistic Study

Add time:07/25/2019    Source:sciencedirect.com

The kinetics and oxidation of 4-methylthiophenyl acetic acid by acidified potassium dichromate was studied spectro photometrically at constant ionic strength 0.01mol/dm3. The reaction exhibits 2:1 stoichiometry. The first order dependence of the reaction on [K2Cr2O7]o was noticed and less than unity order dependence on [MTPA]o and [H2SO4]. The reaction was studied by varying the temperature and the activation parameters are calculated from the experimental data. The activation parameters Ea(kJ/mol), ΔH#(kJ/mol), ΔS#(J/K/mol) and ΔG#(kJ/mol) for the rate determining step were obtained. Impact of ionic strength has been studied. Rate constant for the rate determining step was calculated and a suitable mechanism has been proposed.

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