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Research Article

Kinetics and Mechanism of Osmium(VIII)-Catalyzed Oxidation of Thiomorpholine by Alkaline Hexacyanoferrate(III)

Mohammed M. Al Subu
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Thiomorpholine (tetrahydro-1,4-thiazine), in the presence of Os(VIII) as catalyst, is oxidized by alkaline hexacyanoferrate(III) to 2-hydroxythiomorpholine. There is a first-order dependence in [Fe(CN)63-] and [Os(VIII)] and zero-order dependence in [thiomorpholine] and [OH-]. The observed rate constant was dependent on [Fe(CN)64-] the type of electrolyte and the permitivitty of the reaction medium (10-40% ethanol). The proposed mechanism includes the formation of a transient [OsO4(OH)2 ]2--thiomorpholine complex prior to the rate-determining regeneration of OsVIII by [Fe(CN)63-]. The values of the enthalpy and entropy of activation are calculated from rate constant values measured at different temperatures (20-40 ° C).

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  How to cite this article:

Mohammed M. Al Subu , 2002. Kinetics and Mechanism of Osmium(VIII)-Catalyzed Oxidation of Thiomorpholine by Alkaline Hexacyanoferrate(III). Journal of Applied Sciences, 2: 742-746.

DOI: 10.3923/jas.2002.742.746


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