A highly selective colorimetric and fluorescent chemosensor for Al(III) based-on simple naphthol in aqueous solution

Abstract

A colorimetric and fluorescent chemosensor (L) for Al(III) was synthesized and fully characterized. L could be both used as a colorimetric and fluorescent chemosensor for the detection of Al3+ ions with low detection limit (8.87×10−7M) in CH3CN–H2O (1:1, v/v) solution. The binding ratio of L–Al3+ was determined from the Job plot (absorption and fluorescence spectra) and MALDI-TOF MS data to be 1:1. The binding constant (Ka) of Al3+ binding to L was calculated to be 4.8×105M−1 from a Benesi–Hildebrand plot. Moreover, the binding site of L with Al3+ was determined by 1H NMR titration experiment.