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ID 32964
フルテキストURL
著者
Xie, Guobin Okayama University
Sueishi, Yoshimi Okayama University ORCID Kaken ID publons researchmap
Yamamoto, Shunzo Okayama University
抄録

The emission spectra of toluene (T)–triethylamine (TEA) systems were measured under conditions of steady-state illumination in some protic and aprotic solvent–THF mixtures. The fluorescence spectrum of the T–TEA system in THF could be separated into three component bands (band A at 279 nm (fluorescence of T), band B at 336 nm (fluorescence of TEA) and band C at 373 nm (emission from an intermolecular exciplex)). The intensities of bands B and C decreased with increasing solvent polarity. The decrease in the intensities of bands B and C is considered to be caused by the enhanced conversion of the exciplex to an ion-pair with increase in solvent polarity. The intensities of bands B and C also decreased owing to the hydrogen-bonding interaction between TEA and protic solvents, but in this case the intensity of band A increased. Acetonitrile only has a polar effect and trichloroacetic acid only has a hydrogen-bonding (or protonation) effect, while alcohols have both effects. The equilibrium constants for the formation of intermolecular hydrogen-bonded complexes of TEA with alcohols were estimated from the changes in the intensity of band A. The hydrogen-bonding and polar effects of alcohols on the intensities of bands B and C could be evaluated separately. The ratio of the hydrogen-bonding effect to the polar effect of alcohols was observed to increase with increasing vol.% of alcohol.

キーワード
solvent effect
polar effect
hydrogen-bonding
fluorescence
exciplex
備考
Digital Object Identifer:10.1016/S1010-6030(03)00413-1
Published with permission from the copyright holder. This is the institute's copy, as published in the Journal of Photochemistry and Photobiology a-Chemistry, March 2004, Volume 162, Issue 2-3, Pages 449-456.
Publisher URL:http://dx.doi.org/10.1016/S1010-6030(03)00413-1
Direct access to Thomson Web of Science record
Copyright © 2004 Elsevier B.V. All rights reserved.
発行日
2004-3
出版物タイトル
Journal of Photochemistry and Photobiology A: Chemistry
162巻
2-3号
開始ページ
449
終了ページ
456
資料タイプ
学術雑誌論文
言語
English
査読
有り
DOI
Web of Science KeyUT
Submission Path
chemistry_general/3