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Kinetics and mechanism of the oxidation of tris(1,10-phenanthroline)iron(II) by peroxomonosulphate (oxone) ion by Manu Mehrotra; Raj N. Mehrotra is a Chemistry article available to read on EtoBox.

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The oxidation of tris(1,10-phenanthroline)Fe(II) with peroxomonosulphate (oxone) ion is first order with respect to both the substrate and the oxidant. The rate is accelerated by the alkali metal ion and the plot of k 0 against [M + ] indicates that a part of the rate is independent of [alkali metal ion] where k 0 is the true rate constant for the reaction and is equal to k obs À k h . The rate constant k h refers to the hydrolysis of [Fe(phen) 3 ] 2+ ion. It is explained by assuming the formation of an ion pair between M + and SO 5 2À ions whereas a similar ion pair between M + and HSO 5 À ions is not favoured in view of the slope value of the Davies plot for the effect of ionic strength which has a slope of À2.02. There is spectral evidence for the formation of an intermediate and accordingly the intermediates [Fe(phen) 3 Á Á ÁHSO 5 ] + and [Fe(phen) 3 Á Á ÁMÁ Á ÁSO 5 ] + are assumed to be formed in the proposed mechanism where M + ion acts as a bridge. The disproportionation of the intermediates is considered to be rate determining. The H + ions retard the rate and the plot of k 0 [H + ] against [H + ] has an intercept on the rate ordinate.

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Author

Manu Mehrotra; Raj N. Mehrotra

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0277-5387)

Published

2008

Language

EN

Field

Chemistry (Physical Sciences)