Ratiometry of monomer/excimer emissions of dipyrenyl calix[4]arene in aqueous media
- Authors
- Kim, Hyun Jung; Quang, Duong Tuan; Hong, Jooyeon; Kang, Guipeun; Ham, Sihyun; Kim, Jong Seung
- Issue Date
- Oct-2007
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Citation
- TETRAHEDRON, v.63, no.44, pp 10788 - 10792
- Pages
- 5
- 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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