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PHOTOREDUCTION OF THIONINE BY WATER

Güler Somer, A. Temizer

Open publisher page 8 citations

Abstract

Abstract —The photoreduction of thionine by water has been studied, using a technique applied in earlier work on photoreduction of methylene blue. It is found for thionine as for methylene blue, that a long‐lived excited intermediate is formed, and that two such intermediates react to produce a single reduced molecule, thus providing adequate energy for the reaction. The mechanism proposed for methylene blue photoreduction is shown to be applicable to thionine photoreduction as well, indicating the unimportance of the amine methyl groups. Although in previous work it was suggested that H2O was the reducing agent, none of them, however, could determine the H2O2 formed. The formation of H2O2 is confirmed in this work, and the kinetics of its formation are shown to be in accordance with the mechanism.

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Abstract —The photoreduction of thionine by water has been studied, using a technique applied in earlier work on photoreduction of methylene blue. It is found for thionine as for methylene blue, that a long‐lived excited intermediate is formed, and that two such intermediates react to produce a single reduced molecule, thus providing adequate energy for the reaction. The mechanism proposed for methylene blue photoreduction is shown to be applicable to thionine photoreduction as well, indicating the unimportance of the amine methyl groups. Although in previous work it was suggested that H2O was the reducing agent, none of them, however, could determine the H2O2 formed. The formation of H2O2 is confirmed in this work, and the kinetics of its formation are shown to be in accordance with the mechanism.

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Available abstract

Abstract —The photoreduction of thionine by water has been studied, using a technique applied in earlier work on photoreduction of methylene blue. It is found for thionine as for methylene blue, that a long‐lived excited intermediate is formed, and that two such intermediates react to produce a single reduced molecule, thus providing adequate energy for the reaction. The mechanism proposed for methylene blue photoreduction is shown to be applicable to thionine photoreduction as well, indicating the unimportance of the amine methyl groups. Although in previous work it was suggested that H2O was the reducing agent, none of them, however, could determine the H2O2 formed. The formation of H2O2 is confirmed in this work, and the kinetics of its formation are shown to be in accordance with the mechanism.

Key concepts: Thionine, Methylene blue, Photochemistry, Chemistry, Excited state, Methylene, Amine gas treating, Molecule

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