ID | 32964 |
フルテキストURL | |
著者 |
Xie, Guobin
Okayama University
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
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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
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出版物タイトル |
Journal of Photochemistry and Photobiology A: Chemistry
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巻 | 162巻
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号 | 2-3号
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開始ページ | 449
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終了ページ | 456
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資料タイプ |
学術雑誌論文
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言語 |
英語
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査読 |
有り
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DOI | |
Web of Science KeyUT | |
Submission Path | chemistry_general/3
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