Journal of Chemical and Pharmaceutical Research (ISSN : 0975-7384)

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Original Articles: 2012 Vol: 4 Issue: 7

A mechanistic study based on kinetics of the oxidation of diethyl ketone by Ir (III) chloride in aqueous perchloric acid medium when cerium (IV) perchlorate is used as a catalyst

Abstract

This mechanistic study on the oxidation of diethyl ketone by Ir (III) chloride in aqueous perchloric a cid medium when cerium (IV) perchlorate is used as a catalyst has been done at temperature range of 293 to 308 K under conditions such that, [Ir] T << [Ce (IV)] T << [CH 3 -CH 2 -CO-CH 2 -CH 3 ] so that the reaction constants of different steps involved have been evaluated with great ease and accuracy the rate of reaction tends towards zer o-order at higher concentration and first order at lower conce ntration with respect to ceric perchlorate and diet hyl ketone. Order of reaction is unity with respect to [Ir (III )] in the concentration range studied. On increasin g the concentrations of [H + ] the rate decreases slightly. The effect of ionic strength and the dielectric constant on reaction rate has also been studied. The active spe cies of oxidant is indicated to be Ce 4+ and Ce (OH) 3+ . An intermediate involving the oxidant, catalyst and su bstrate has been proposed as being formed in pre-eq uilibrium steps. The calculation of activation parameters is done with tremendous analysis with respect to slow step of mechanism