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PHOTOREDUCTION OF THIONINE BY WATER
Author(s) -
Somer Güler,
Temizer Aytekin
Publication year - 1984
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.1751-1097.1984.tb05344.x
Subject(s) - thionine , methylene blue , photochemistry , chemistry , excited state , methylene , amine gas treating , molecule , kinetics , alicyclic compound , medicinal chemistry , organic chemistry , catalysis , photocatalysis , physics , electrode , quantum mechanics , nuclear physics , electrochemistry
—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 H 2 O was the reducing agent, none of them, however, could determine the H 2 O 2 formed. The formation of H 2 O 2 is confirmed in this work, and the kinetics of its formation are shown to be in accordance with the mechanism.