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SENSITIZED PHOTOOXYGENATION ACCORDING TO TYPE I MECHANISM (RADICAL MECHANISM) — PART II. FLASH PHOTOLYSIS EXPERIMENTS
Author(s) -
KRAMER H. E. A.,
MAUTE A.
Publication year - 1972
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.1751-1097.1972.tb06219.x
Subject(s) - thionine , photooxygenation , flash photolysis , photochemistry , chemistry , flash (photography) , oxygen , kinetics , singlet oxygen , organic chemistry , optics , reaction rate constant , electrochemistry , physics , electrode , quantum mechanics
— In order to gain further insight into the sensitized photooxygenation of the system thionine, allylthiourea, and oxygen, the influence of the leucothionine, which is formed during the photoreaction, was studied by flash photolysis. In the presence of leucothionine, additional thionine (Λ obs = 598 nm) is reformed; i.e., leucothionine is oxidized to thionine by way of a semithionine intermediate (Λ bs = 770 nm). This additional semithionine formation due to leucothionine is complete by 30 μsec after the flash. By varying the leucothionine concentration, the flash intensity and the pH it can be shown that the agent which oxidizes leucothionine to semithionine is identical to the agent which transforms semithionine to thionine.