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PHOTOCHEMICAL INVESTIGATIONS OF OXAZINE, THIAZINE AND SELENAZINE DYES. THE REACTIVITY OF PROTOLYTIC TRIPLET FORMS IN ELECTRON TRANSFER REACTIONS
Author(s) -
Vogelmann Ekehardt,
Kramer Horst E. A.
Publication year - 1976
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.1751-1097.1976.tb07270.x
Subject(s) - thionine , flash photolysis , chemistry , photochemistry , triplet state , reactivity (psychology) , thiazine , semiquinone , electron transfer , reaction rate constant , kinetics , redox , organic chemistry , molecule , medicine , physics , alternative medicine , electrode , quantum mechanics , pathology , electrochemistry
— The photoreduction of oxonine, thionine and selenine with the reducing agent allylthiourea was investigated by flash photolysis. The oxonine triplet state was produced by triplet‐triplet energy transfer with 9,10‐dibromoanthracene as donor. For all three dyes the rate constant of the electron transfer is considerably higher for the acid triplet form than that of the corresponding reaction of the basic triplet form. It is shown that the higher reactivity of the acid triplet can be related to its higher reduction potential which is available from the difference of the pK values of triplet and semiquinone of the dye.