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EFFECT OF WATER ON PHOTOCHEMICAL REDUCTION OF CONCENTRATED THIONINE SOLUTION BY VISIBLE LIGHT
Author(s) -
Temizer Aytekin
Publication year - 1985
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.1751-1097.1985.tb03460.x
Subject(s) - thionine , photochemistry , chemistry , polarography , electrochemistry , oxygen , inorganic chemistry , electrode , organic chemistry
— The photochemical reactions in concentrated thionine solution have been studied using continuous illumination. Thionine solution is photoreduced to leucothionine in an oxygen‐free acidic medium. Electrochemical measurements of the photoreduction of thionine are reported. A possible reaction pathway for the energy transfer is proposed. It is found that polymeric forms of thionine and leucothionine are not involved in photoreduction. It is proposed that a complex must be formed prior to photochemical reduction. This complex species, having a lifetime of several seconds, is reduced to leucothionine, water being the reducing agent. Following this reduction, H 2 O 2 is formed and the production of H 2 O 2 is detected by differential pulse polarography.