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ZINC TETRAPHENYLPORPHYRIN‐SENSITIZED PHOTOREDUCTION OF ANTHRAQUINONESULFONATE IN AQUEOUS MICELLAR SOLUTIONS *
Author(s) -
Kano Koji,
Takuma Keisuke,
Ikeda Tsuyoshi,
Nakajima Daisuke,
Tsutsui Yashuhiro,
Matsuo Taku
Publication year - 1978
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1978.tb07666.x
Subject(s) - chemistry , ascorbic acid , micelle , pulmonary surfactant , photochemistry , aqueous solution , redox , semiquinone , flash photolysis , inorganic chemistry , cationic polymerization , tetraphenylporphyrin , micellar solutions , ionic bonding , organic chemistry , kinetics , reaction rate constant , ion , biochemistry , physics , food science , quantum mechanics , porphyrin
— Zn‐tetraphenylporphyrin (ZnTPP), solubilized in non‐ionic surfactant micelles, was found to sensitize photoreductions of some sodium anthraquinonesulfonatesz in the presence of ascorbic acid under anaerobic conditions. The reaction rate was increased by the addition of an anionic surfactant, while retardation was observed with a cationic surfactant. The pH‐reaction rate profiles showed maxima located in the order corresponding to p K a ‐values for the semiquinone of each anthraquinone‐sulfonate. A reaction scheme involving the formation of ZnTPP + at the primary step, followed by back‐reduction with ascorbic acid, is proposed. The reaction scheme is in good agreement with the results of flash photolysis. The surfactant micelles are suggested to aid the charge‐separation between the ionic species just after the redox reaction involving the photoexcited ZnTPP and anthraquinonesulfonates.

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