Abstract
Abstract A 2-hydroxy-1-naphthaldehyde-based chemosensor, 4-hydroxy-3-[(2-hydroxy-1-naphthyl)methylideneamino]benzoic acid (H2L) was synthesized and characterized by IR spectrum, elemental analysis, mass spectrum, 1H NMR and single crystal X-ray diffraction. Fluorescent spectra show that H2L can be used to detect Al3+ ions not only in ethanol, but also in DMF and DMSO. The enhancement of fluorescent intensity can be observed by naked-eye. And the detection limit can reach 10−9 M. The Job’s plot, 1H NMR titration, and electrospray ionization mass spectrometry (ESI-MS) results show that Al3+ ions and H2L form a 2:1 complex. Further study shows that this detection was reversible and ESIPT process can be used to explain the sensing mechanism.
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