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Titolo:
Excited-state reaction of short-lived 2-methylbenzophenone enols studied by stepwise two-color excitation time-resolved thermal lensing technique
Autore:
Suzuki, T; Omori, T; Ichimura, T;
Indirizzi:
Tokyo Inst Technol, Dept Chem & Mat Sci, Meguro Ku, Tokyo 1528551, Japan Tokyo Inst Technol Tokyo Japan 1528551 , Meguro Ku, Tokyo 1528551, Japan
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY A
fascicolo: 50, volume: 104, anno: 2000,
pagine: 11671 - 11676
SICI:
1089-5639(200012)104:50<11671:EROS2E>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTRAMOLECULAR HYDROGEN ABSTRACTION; TRIPLET-STATE; QUANTUM YIELD; PHOTOENOLIZATION; SPECTROSCOPY; BENZOPHENONE; KETONES; 2-METHYLACETOPHENONE; BIRADICALS; RADICALS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
47
Recensione:
Indirizzi per estratti:
Indirizzo: Ichimura, T Tokyo Inst Technol, Dept Chem & Mat Sci, Meguro Ku, Tokyo 1528551, Japan Tokyo Inst Technol Tokyo Japan 1528551 Tokyo 1528551, Japan
Citazione:
T. Suzuki et al., "Excited-state reaction of short-lived 2-methylbenzophenone enols studied by stepwise two-color excitation time-resolved thermal lensing technique", J PHYS CH A, 104(50), 2000, pp. 11671-11676

Abstract

Reaction dynamics on excited states of two kinds of enols (Z and E) for 2-methylbenzophenone (MBP), which are produced through an intramolecular hydrogen abstracting reaction with the 308-nm laser irradiation, has been studied in ethanol solution with stepwise two-color excitation time-resolved thermal lensing (TC-TRTL) and stepwise two-color excitation transient absorption techniques. When the E-enol was solely excited with the 532-nm laser, the increase of the transient absorption was observed at less than 420 nm, while no spectral change appeared for excitation of the Z-enol. It reveals that only the E-enol does react after the excitation to presumably produce dihydroanthrone (DHA). The heat of reaction was successfully determined by the TC-TRTL method, and the reaction was found to occur endothermically. The candidates for the photoproduct were also discussed.

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Documento generato il 03/04/20 alle ore 04:32:46