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초록
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.
키워드
DENSITY-FUNCTIONAL THEORY; PYRENE EXCIMER EMISSION; FLUORESCENT CHEMOSENSORS; SENSORS; BINDING; IONS; PET; RECEPTORS; SOLVENTS; SODIUM
- 제목
- Ratiometry of monomer/excimer emissions of dipyrenyl calix[4]arene in aqueous media
- 저자
- Kim, Hyun Jung; Quang, Duong Tuan; Hong, Jooyeon; Kang, Guipeun; Ham, Sihyun; Kim, Jong Seung
- 발행일
- 2007-10
- 유형
- Article
- 저널명
- Tetrahedron
- 권
- 63
- 호
- 44
- 페이지
- 10788 ~ 10792