Kinetics of oxidation of bis(2,2',6',2 "- terpyridine)iron(II) by permanganate ion

Abstract

The kinetics of the reaction between bis(2,2',6',2" -terpyridine) iron(<strong>II</strong>), Fe(tpy)<img src='http://www.niscair.res.in/jinfo/twoplustwo.gif' border=0> and permanganate ion has been studied in sulphuric acid medium using stopped flow spectrophotometry. The reaction exhibit a first order dependence both on the [substrate] and [oxidant]. The influence of hydrogen ions on the rate shows two paths <em>viz., </em> acid dependent and acid independent paths. Protonated and unprotonated forms of permanganate are considered to be the reactive oxidising species. At 25^oC the protonated species is <em>ca </em>10⁶ more reactive than the unprotonated form. The products do not have any inhibitory effect on the reaction.