Formation of radical pairs by photochemical reduction of sterically hindered quinones with phenols in frozen solutions

Авторы: Aleksandrov A.I., Bubnov N.N., Lazarev G.G., Lebedev Ya S., Prokof\textquotesingleev A.I., Serdobov M.V.
Журнал: Bulletin of the Academy of Sciences of the USSR Division of Chemical Science
Том: 25
Номер: 3
Год издания: 1976
Первая страница: 498
Последняя страница: 502
DOI: 10.1007/bf01106640
Аннотация: Ultraviolet irradiation of aromatic ketones in the presence of hydrogen- or electron-donors leads to the photochemical reduction of the carbonyl group [1-3]. When such processes are accompanied by hydrogen transfer, the donor and acceptor molecules are converted into neutral radicals. When the photolysis is carried out at low temperature, these radicals are quite stable and may form a single two-spin system, viz. a radical pair (RP), with a characteristic ESR spectrum [4]. The photochemical reduction of frozen solutions of sterically hindered 3,6-di-t-butyl- o-benzoquinone and 2,4,6-tri-t-butylphenoI in benzene and CCI 4 leads to the formation of RP's in which the distance between the unpaired electrons is 6.3 A. The RP's consist of 3,6-di-t-butyl-4-oxophenoxyl and 2 , 4 , 6 - t r i - t - butylphenoxyl radicals, and they are formed as a result of the photochemical dehydrogenation of the phenol by triplet-excited quinone molecules.
Добавил в систему: Александров Алексей Иванович

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