Hydrogen atom abstraction of p-chloranil triplet in 1,4-dioxane in the presence and absence of tetrachlorohydroquinone.
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概要
- 論文の詳細を見る
Mechanisms of hydrogen atom abstraction by triplet <I>p</I>-chloranil [CA(T)] from 1,4-dioxane (DOH) and tetrachlorohydroquinone (CAH<SUB>2</SUB>) were studied in detail by means of nanosecond laser flash photolysis. A broad band around 740 nm in the transient absorption spectrum of CA in DOH was assigned to the charge-transfer band of the triplet EDA complex between CA and DOH. Efficiencies for the hydrogen atom abstraction from DOH and CAH<SUB>2</SUB> were determined to be 0.13 and 0.58, respectively. The former value indicates that the hydrogen atom abstraction from DOH is less effective than a physical process in deactivation of the triplet complex. From the latter value together with the measured value of the quenching rate constant (1.7×10<SUP>9</SUP> dm<SUP>3</SUP> mol<SUP>−1</SUP> s<SUP>−1</SUP>) of the triplet by CAH<SUB>2</SUB>, it is inferred that the hydrogen atom abstraction of CA(T) from CAH<SUB>2</SUB> takes place competing with an efficient radiationless deactivation <I>via</I> the triplet exciplex between CA(T) and CAH<SUB>2</SUB> as a common intermediate.
- 公益社団法人 日本化学会の論文
著者
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Morita Toshifumi
Department Of Aerospace Engineering College Of Science And Technology Nihon University
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Kobashi Harumichi
Department of Chemistry, Faculty of Engineering Gunma University
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Kobashi Harumichi
Department of Chemistry, Gunma University, Kiryu
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Morita Toshifumi
Department of Chemistry, Gunma University, Kiryu
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Tomioka Yasunaka
Department of Chemistry, Gunma University, Kiryu
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