The photoreduction and photosensitized reduction of dyes bound to a surfactant micellar surface.

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概要

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• The photochemical reduction of thionine(Th) and Methylene Blue(MB) bound to anionic sodium dodecyl sulfate(SDS) micelles in an aqueous solution was inhibited at the lower concentration range of a reductant anion, EDTA, because of the electrostatic repulsion between the micelles and the reductant. The concentration dependence of EDTA on the quantum yield of photoreduction has shown to be, anomalously a sigmoidal type: this is explained by mechanistic interpretation based on the cooperative effects of the ionic strength and the essential concentration of EDTA. The enhancement effect for the quantum yield of the photoreduction of eosine bound to a cationic micelle by the EDTA anion was conversely observed, because of the electrostatic attraction. When 10-dodecyl) (Acridine Orange) was incorporated into SDS micelles in water containing EDTA and ascorbic acid, and the mixture was excited, the photosensitized reduction of MB bound to the micelles occurred. It was found that the quantum yield of the sensitized reduction depended on the concentration of MB and was larger than the yield on the direct excitation of MB.

• 公益社団法人 日本化学会の論文

著者

• Usui Yoshiharu

  Department Of Achemistry Faculty Of Science Ibaraki University

• Usui Yoshiharu

  Department of Chemistry, Faculty of Sciences, Ibaraki University

• Saga Kazuhiko

  Department of Chemistry, Faculty of Sciences, Ibaraki University

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