One-step, two-electron oxidation of cis-diaquabis(1,10-phenanthroline)chromium(III) to cis-dioxobis(1,10-phenanthroline)chromium(V) by periodate in aqueous acidic solutions

Ali, Ismat H. and Sulfab, Yousif (2011) One-step, two-electron oxidation of cis-diaquabis(1,10-phenanthroline)chromium(III) to cis-dioxobis(1,10-phenanthroline)chromium(V) by periodate in aqueous acidic solutions. International Journal of Chemical Kinetics, 43. pp. 563-568. ISSN 05388066

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Official URL: http://dx.doi.org/10.1002/kin.20593

Abstract

The kinetics of oxidation of cis-[Cr III(phen)2(H2O)2]3(phen = 1,10-phenanthro-line) by IO−4 has been studied in aqueous acidic solutions. In the presence of a vast excess of[IO−4], the reaction is first order in the chromium(III) complex concentration. The pseudo-first-order rate constant,k obs, showed a very small change with increasing [IO−4]. The dependence of kobs on [IO−4] is consistent with Eq. (i).k obs =a[IO−4]/(b+c[IO−4])(i)The pseudo-first-order rate constant,k obs, increased with increasing pH, indicating that the hydroxo form of the chromium(III) complex is the reactive species. An inner-sphere mechanism has been proposed for the oxidation process. The thermodynamic activation parameters of the processes involved are also reported.

Item Type: Article
Subjects: Chemistry
Divisions: College of Sciences > Chemistry
Depositing User: Ismat SidAhmed
Date Deposited: 23 Nov 2015 12:43
Last Modified: 23 Nov 2015 12:43
URI: http://eprints.kku.edu.sa/id/eprint/207

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