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ID 32965
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Author
Guobin, Xie
Nakamura, Mayuko
Yamamoto, Shunzo
Abstract

The effects of the additions of protic and aprotic polar solvents on the emission spectrum of 4-phenyl-1-N,N-dimethylaminobutane (PDAB) in THF have been studied under conditions of steady-state illumination. The fluorescence spectrum of PDAB in THF was reported to consist of three component bands (band A at 285 nm (fluorescence of the phenyl group), band B at 343 nm (fluorescence of the amino group) and band C at 385 nm (emission from an intramolecular exciplex)). The intensities of bands B and C decreased with increasing solvent polarity. They also decreased owing to the hydrogen-bonding interaction between the amino group in PDAB and protic solvents, but in this case the intensity of band A was found to increase. Acetonitrile has only a polar effect and trichloroacetic acid only a hydrogen-bonding (or protonation) effect, while alcohols have both effects. The equilibrium constants for the formation of intermolecular hydrogen-bonded complexes of the amino group with alcohols were estimated from the intensity change of band A. The hydrogen-bonding and polar effects of alcohols on the intensities of bands B and C could be separately evaluated. The decrease in the intensities of bands B and C with increasing solvent polarity in THF-AN and THF-alcohol mixtures is considered to be caused by the conversion of the exciplex to an ion-pair enhanced by the increase in solvent polarity.

Keywords
solvent effect
polar effect
hydrogen-bonding
fluorescence
exciplex
Note
Digital Object Identifer:10.1016/S1010-6030(03)00340-X
Published with permission from the copyright holder. This is the institute's copy, as published in the Journal of Photochemistry and Photobiology a-Chemistry, February 2004, Volume 162, Issue 1, Pages 73-79.
Publisher URL:http://dx.doi.org/10.1016/S1010-6030(03)00340-X
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Copyright © 2004 Elsevier B.V. All rights reserved.
Published Date
2004-2
Publication Title
Journal of Photochemistry and Photobiology A: Chemistry
Volume
volume162
Issue
issue1
Start Page
73
End Page
79
Content Type
Journal Article
language
英語
Refereed
True
DOI
Web of Science KeyUT
Submission Path
chemistry_general/4