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첨단연성물질 연구단
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Photoinduced strong acid-weak base reactions in a polar aprotic solvent

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Title
Photoinduced strong acid-weak base reactions in a polar aprotic solvent
Author(s)
Lee Y.M.; Sun-Young Park; Kim H.; Kim T.G.; Oh-Hoon Kwon
Publication Date
2016-06
Journal
METHODS AND APPLICATIONS IN FLUORESCENCE, v.4, no.2, pp.024004 -
Publisher
IOP PUBLISHING LTD
Abstract
The excited-state proton transfer (ESPT) of the strong photoacid, N-methyl-7-hydroxyquinolinium, was studied in the presence of different weak bases such as methanol, ethanol, and dimethyl sulfoxide in an aprotic solvent of acetonitrile. Here, we present chemical kinetics analysis of the ESPT mechanism to explain biphasic fluorescence decay of the parent photoacid and the sign reversal of the rise and decay of the resulting conjugate-base fluorescence. The ESPT of the free photoacid showed a molecularity of 2 with reacting alcohol molecules. In the ground state, it was found that a fraction of the photoacid formed 1: 2 hydrogen-bonded complexes with the residual water present in the aprotic solvent or 1: 1 complexes with the additive alcohols. In the excited state, these adducts underwent proton transfer when complexed further with diffusing alcohol molecules. © 2016 IOP Publishing Ltd
URI
https://pr.ibs.re.kr/handle/8788114/2722
ISSN
2050-6120
Appears in Collections:
Center for Soft and Living Matter(첨단연성물질 연구단) > Journal Papers (저널논문)
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