Stopped-flow kinetic investigations of one-electron transfer reactions of phenothiazines and their radical cations in aqueous solution.

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概要

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• The kinetics of one-electron oxidation of the protonated forms of phenothiazines namely, chlorpromazine (CPZH<SUP>+</SUP>) and promethazine (PMZH<SUP>+</SUP>) with the inorganic peroxides, peroxomonosulfate and peroxodisulfate in aqueous medium, were investigated by stopped flow spectrophotometric technique. The reactions of both the phenothiazines obeyed a total second-order kinetics, first-order each with respect to [phenothiazine] and [peroxide]. Both peroxides generated radical cations from the respective phenothiazines by one-electron transfer. The radical cations, CPZH<SUP>·2+</SUP> and PMZH<SUP>·2+</SUP> were found to oxidize ascorbic acid generating the parent compounds, whereas CPZH<SUP>·2+</SUP> alone was able to react with sulfite, thiosulfate and dithionite to regenerate CPZH<SUP>+</SUP>. The kinetics of all these reactions were investigated and discussed.

• 公益社団法人 日本化学会の論文

著者

• Maruthamuthu Pichai

  Department Of Energy University Of Madras Guindy Campus

• Venkatasubramanian Lakshmanan

  Department of Energy, University of Madras, A. C. College Campus

• Maruthamuthu Pichai

  Department of Chemistry, University of Madras, Autonomous post-Graduate Centre

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• Stopped-flow kinetic investigations of one-electron transfer reactions of phenothiazines and their radical cations in aqueous solution.
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