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Kinetic Study of the Oxidation of N,N-Dimethylethanolamine by Bis(Hydrogenperiodato)Argentate(III) in Aqueous Solution

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Abstract

The oxidation of N,N-dimethylethanolamine (DMEA) by bis(hydrogenperiodato) argentate(III) ([Ag(HIO6)2]5−) was studied in aqueous alkaline medium. Formaldehyde and dimethylamine were identified as the major oxidation products after the oxidation of DMEA. The oxidation kinetics was followed spectrophotometrically in the temperature range of 25.0 °C–40.0 °C. It was found that the reaction was first order in [Ag(III)]; the oberved first-order rate constants k obsd as functions of [DMEA], [OH−] and total concentration of periodate (\([\mathrm{IO}_{4}^{-}]_{\mathrm{tot}}\)) were analyzed and were revealed to follow a rate expression: \(k_{\mathrm{obsd}} = (k_{1} +k_{2}[\mathrm{OH}^{-}])K_{1}K_{2}[\mathrm{DMEA}]/\{f([\mathrm{OH}^{-}])[\mathrm{IO}_{4}^{-}]_{\mathrm{tot}}+ K_{1} + K_{1}K_{2}[\mathrm{DMEA}]\}\). Rate constants k 1 and k 2 and equilibrium constant K 2 were derived; activation parameters corresponding to k 1 and k 2 were computed. In the proposed reaction mechanism, a peridato-Ag(III)-DMEA ternary complex is formed indirectly through a reactive intermediate species [Ag(HIO6)(OH)(H2O)]2−. In subsequent rate-determining steps as described by k 1 and k 2, the ternary complex decays to Ag(I) through two reaction pathways: one of which is spontaneous and the other is prompted by an OH−.

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Authors and Affiliations

  1. School of Public Health, Hebei Medical University, Shijiazhuang, 050017, Hebei Province, P.R. China

    Hongmei Shi & Weijun Kang

  2. School of Chemistry and Environmental Science, Hebei University, Baoding, 071002, Hebei Province, P.R. China

    Yukun Guo

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  1. Hongmei Shi
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  2. Yukun Guo
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Correspondence to Hongmei Shi.

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Shi, H., Guo, Y. & Kang, W. Kinetic Study of the Oxidation of N,N-Dimethylethanolamine by Bis(Hydrogenperiodato)Argentate(III) in Aqueous Solution. J Solution Chem 40, 1371–1381 (2011). https://doi.org/10.1007/s10953-011-9713-3

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