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Vol. 30 No. 1 (2018): Vol 30 Issue 1

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Role of Ru(III) as Inhibitor in Oxidation of Arabinose and Ribose by [Cu(bipy)2]2+ in Alkaline Medium: Spectrophotometric and Kinetic Studies

https://doi.org/10.14233/ajchem.2018.20951
Bharati Behera
Department of Chemistry, Utkal University, Bhubaneswar-751 004, India
Jashoda Behera
Department of Chemistry, Utkal University, Bhubaneswar-751 004, India

Corresponding Author(s) : Jashoda Behera

jbeherachemistry@gmail.com; jbehera2017@gmail.com

Asian Journal of Chemistry, Vol. 30 No. 1 (2018): Vol 30 Issue 1

Abstract

The kinetics and mechanism of oxidation of arabinose and ribose by [Cu(bipy)2]2+ in alkaline medium has been studied spectrophotometrically at 50 °C. The rate is first order in [oxidant] (i.e. [Cu(bipy)2]2+). From rate equation, the rate of reaction was found to be directly proportional to [sugar] and [OH–] and inversely proportional to [Ru(III)]. There is a substantial decrease in the pseudo first order rate constant with increase in the concentration of RuCl3, indicating the role of RuCl3 as an inhibitor. The reaction also shows slight decrease in rate by increasing dielectric constant of the medium. Ionic strength of the medium and [Cl–] have no effect on the rate of oxidation. The activation parameters for the rate determining step have been calculated. Based on kinetic data and spectrophotometric evidences, a suitable mechanism is proposed.

Keywords

Kinetics Reaction mechanisms Oxidations Copper-bipyridyl complex Ruthenium(III) chloride Arabinose Ribose
Behera, B., & Behera, J. (2017). Role of Ru(III) as Inhibitor in Oxidation of Arabinose and Ribose by [Cu(bipy)2]2+ in Alkaline Medium: Spectrophotometric and Kinetic Studies. Asian Journal of Chemistry, 30(1), 138–144. https://doi.org/10.14233/ajchem.2018.20951
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