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Ratiometry of monomer/excimer emissions of dipyrenyl calix[4]arene in aqueous media

Authors
Kim, Hyun JungQuang, Duong TuanHong, JooyeonKang, GuipeunHam, SihyunKim, Jong Seung
Issue Date
Oct-2007
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
TETRAHEDRON, v.63, no.44, pp.10788 - 10792
Journal Title
TETRAHEDRON
Volume
63
Number
44
Start Page
10788
End Page
10792
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/14622
DOI
10.1016/j.tet.2007.05.130
ISSN
0040-4020
Abstract
Variations in the ratio of monomer/excimer emissions from pyrenyl groups bound to a calix[4]arene through facing carboxamidomethyl substituents have been investigated in H2O/CH3CN mixtures. Above a level of 50% H2O, monomer emission declines and the excimer emission concomitantly increases. DFT calculations support the argument that disruption of intramolecular NHO bonds by water results in a geometry, which favors contact of the pyrene units and thus a strong excimer emission. Addition of Fe(III) to a H2O/CH3CN (4:1, v/v) solution of 1 at pH 6.1 quenches both monomer and excimer emissions through electron transfer (eT) from excited pyrene to the metal ion. (C) 2007 Elsevier Ltd. All rights reserved.
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