1. A reversible and visible colorimetric/fluorescent chemosensor for Al3+ and F− ions with a Large Stoke's shift.
- Author
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Zhao, Yuan-Hui, Zeng, Xi, Mu, Lan, Li, Jun, Redshaw, Carl, and Wei, Gang
- Subjects
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ALUMINUM compounds , *COLORIMETRIC analysis , *CHEMORECEPTORS , *FLUORESCENCE spectroscopy , *FLUORINE , *QUINOLINE , *ELECTRON donor-acceptor complexes , *PROTON transfer reactions - Abstract
A quinoline-vinyl-dihydroxylphenyl linkage comprising a donor-π-bridge-acceptor structural motif, in which the quinoline serves as an electron-withdrawing core, has been synthesized and used as a fluorescent sensor ( 2 ) for the recognition of Al 3+ and F − by colorimetry/fluorescence. The sensor 2 exhibited little fluorescence due to excited-state intramolecular proton transfer from the hydroxyl oxygens to the nitrogen of the quinoline moiety. By contrast, on coordination of Al 3+ or F − , sensor 2 afforded strong fluorescence. A reversible “off–on” optical switching mode has been constructed by sequential inputs from Al 3+ and F − ions to the sensor 2 via different excitation and emission wavelengths. 1 H NMR and IR spectroscopic analysis revealed that the Al 3+ is coordinated to the quinoline nitrogen and phenolic oxygen atoms, whereas the F − center is only coordinated by two phenolic oxygen atoms. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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