Abstract
Abstract A novel colorimetric probe 2-hydroxy-1-naphthylaldehyde-2-quinoline acylhydra-zone (L) was synthesized and its structure was characterized by FT-IR, 1H NMR, 13C NMR and HRMS method. The sensing ability of the probe towards anions (F−, Cl−, Br−, I−, NO3−, AcO−, HSO4−, H2PO4−, ClO4−) was determined by colorimetric, UV–vis and NMR studies. The results showed that L had an efficient colorimetric sensing ability for fluoride ion by changing color from colorless to yellow. The probe L bound to F− in a 1:2 stoichiometric manner. Furthermore, the binding constant of the complex was 1.37 × 109 M−2 with the detection limit of 8.28 × 10−6 M. The recognition mechanism was attributed to the intermolecular proton transfer between the hydroxyl group of the probe L and the fluoride according to 1H NMR titration method.
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