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

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 x 10(-7) M) 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 (K-a) of Al3+ binding to L was calculated to be 4.8 x 10(5) M-1 from a Benesi-Hildebrand plot. Moreover, the binding site of L with Al3+ was determined by H-1 NMR titration experiment. (C) 2015 Elsevier B.V. All rights reserved.