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Fluorescent Chemosensor for Zinc Ion Detection with Significant Emission Color Change in Aqueous Solution Based on AIEgen
Author(s) -
Feng Qi,
Li Yuanyuan,
Li Kai,
Lu Jinying,
Wang Jinmin,
Fan Pengyu,
Li Dakuan,
Wu Dongming,
Hou Hongwei
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201700508
Subject(s) - fluorescence , chemistry , detection limit , photochemistry , aqueous solution , metal ions in aqueous solution , naked eye , intramolecular force , salicylaldehyde , ion , zinc , schiff base , chromatography , stereochemistry , organic chemistry , physics , quantum mechanics
Furan‐2‐carbohydrazide‐5‐(2‐thienyl)‐salicylaldehyde Schiff base ( 1 ) was designed and synthesized for the detection of Zn(II) in aqueous solution at neutral pH. Based on its essential excited state intramolecular proton transfer (ESIPT) process, 1 exhibited aggregation‐induced emission (AIE) characteristic with a fluorescence emission at 567 nm. Ratiometric fluorescence changes could be observed in H 2 O/EtOH solutions with different water fraction. After binding to Zn(II) with a molar ratio of 1:1, 1 showed a new fluorescence emission peak at 493 nm and exhibited a 70‐fold fluorescence enhancement. Meanwhile, a significant emission color change from orange‐red to yellow was observed, enabling detecting Zn(II) by naked eye under illumination with a UV lamp. In addition, chemosensor 1 could distinguish Zn(II) from most of the common metal ions effectively. A linear range of 0.10‐10.00 μmol L −1 and a detection limit of 77 nmol L −1 Zn(II) were achieved.