期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 23, 期 21, 页码 5081-5089出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201606024
关键词
aluminium ions; chemodosimeter; fluorescence; hydrolysis; Schiff base
资金
- National Natural Science Foundation of China [21501150, 51502079, 21371155]
- Outstanding Young Talent Research Fund of Zhengzhou University [1521316005]
Fluorescent chemodosimeters based on small organic molecules are widely used in the detection of various analytes. However, chemodosimeters for metal ion detection are still limited to a few transition metals, such as Hg-II, Cu-II, Fe-III, Au-III, etc. In this work, a fluorescent chemodosimeter of 5-chloro-7-phenyliminomethyl-8-hydroxyquinoline (2) for the detection of Al-III is reported. Chemodosimeter 2 exhibits a turn-on fluorescence response to Al-III owing to an Al-III-promoted hydrolysis of carbon-nitrogen double bonds. This reaction yielded a 1-Al complex, which exhibited high fluorescence emission at 487nm based on inhibition of excited-state intramolecular proton transfer (ESIPT). Because of the specific catalytic ability of Al-III, the selectivity of 2 to Al-III is excellent both in aqueous solutions and in solid matrix. The fluorescence enhancement was as high as 582-fold and the turn-on fluorescence can be observed even by the naked eye upon an irradiation with a UV lamp. The detection limit of 2 for Al-III sensing is 54nmolL(-1) and the linear range is 0-50molL(-1). This work provides a new strategy for designing main-group-metal chemodosimeters based on small organic molecules.
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