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Laser flash photolysis studies on the induced-quenching process competing with hydrogen atom abstraction of triplet benzophenone. Heavy atom effect

✍ Scribed by Katsuji Okada; Minoru Yamaji; Haruo Shizuka

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 315 KB
Volume: 254
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(96)00267-9

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✦ Synopsis

The rate constants (kHA and klQ) for the hydrogen atom abstraction (HA) and induced-quenching (IQ) processes between triplet benzophenone (3Bp *) and halogenated toluenes (XTL) were determined by means of nanosecond laser flash photolysis techniques. It was found that the klQ value increased proportionally with increasing the squared summation of the spin-orbit coupling constant (if) of atoms involved in XTL while the knA's were almost indifferent. It was demonstrated that the IQ process was the intersystem crossing process which was induced mainly by the spin-orbit interaction between 3Bp* and XTL.

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Solvent dependence of triplet energy transfer reaction competing with hydrogen atom abstraction between triplet benzophenone and 1-naphthol studied by laser flash photolysis

✍ Minoru Yamaji; Takuya Tanaka; Haruo Shizuka 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 420 KB

It is found that the triplet-triplet energy transfer (ET) reaction between triplet benzophenone ('BP\*) and l-naphthol (ROH) is competitive with the hydrogen atom abstraction (HA) reaction. The rate constant of ET is enhanced with an increase of solvent polarity while that of HA is reduced. A possib