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PHOTOREDUCTION OF METHYLENE BLUE BY WATER *
Author(s) -
SOMER GÜLER,
GREEN MICHAEL E.
Publication year - 1973
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.1751-1097.1973.tb06347.x
Subject(s) - methylene blue , photochemistry , methylene , chemistry , dimer , kinetics , blue light , molecule , photon , materials science , optoelectronics , organic chemistry , catalysis , optics , photocatalysis , physics , quantum mechanics
— The photoreduction of methylene blue in acid solution has been studied electrochemically. It has been found that methylene blue photoreduction proceeds in red light, with only water available as reducing agent. Reaction energy considerations require two photons to reduce each methylene blue molecule. A two‐photon mechanism involving a long‐lived dimer intermediate is proposed, and is shown to lead to the observed kinetics, including the dependence of rate on light intensity and methylene blue concentration.