Effect of Micellar Environment on the Photoreduction of Azo Dyes Sensitized by Tetraphenyl Porphyrin Derivatives
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概要
- 論文の詳細を見る
Photoelectron transfer from tris (hydroxymethyl) aminomethane (Tris) to methyl orange (MO) or methyl yellow (MY) as an electron acceptor was studied with α, β, γ, δ-tetraphenyl porphyrin (TPP) and α, β, γ, δ-tetraphenyl porphyrin trisulfonic acid (TPPS) as sensitizers. The reaction efficiency was reduced when the sensitizer was solubilized in heptaethyleneglycol dodecyl ether (HED) micelles. The partitioning of the sensitizers (TPP, TPPS) and the electron acceptors (MO, MY) was estimated by means of absorption spectral measurements in the micellar solution. At HED concentrations above 0.5 mM in aqueous solution, the sensitizers (TPP, TPPS) were completely solubilized in the micellar phase and thus the reaction environment was transferred from the aqueous phase to the micellar phase. The decrease of the reaction rate in the micellar environment can be explained in terms of the lower polarity in the micellar phase which inhibits charge separation in the sensitizer-acceptor excited complex (exciplex). The reaction rate of the TPPS-MO system was the highest and that of the TPP-MY system was the lowest in the micellar phase, because the former system was accommodated in a rather polar micellar environment, while the latter system was located in a less polar micellar environment. It was also observed that an increase in micellar concentration resulted in a decrease of the reaction rate. This was found to be caused by the decreases in the local concentrations of sensitizer and acceptor, not by a change of the reaction environment.
- 社団法人日本薬学会の論文
- 1984-11-25
著者
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中垣 正幸
Faculty of Pharmaceutical Sciences, Kyoto University
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中垣 正幸
東京コロイド科学研究所
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半田 哲郎
京都大学薬学部
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半田 哲郎
Gifu Pharmaceutical University
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酒井 質子
東京大学医科研
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酒井 質子
Faculty of Pharmaceutical Sciences, Kyoto University
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中垣 正幸
Tokyo Insitute Of Colloid Science
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