Abstract
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 H2O/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.
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