K. Bouhadir, Jomana Elaridi, G. Sonji
Jun 5, 2021
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Journal
Luminescence : the journal of biological and chemical luminescence
Abstract
Detection and quantification of the cyanide ion has attracted considerable attention because of its extreme toxicity. A novel Zn (II)-complex, applicable as a fluorescent chemosensor for cyanide ion recognition, was synthesized in excellent yields from the reaction of zinc sulfate with the novel hydrazone: 3-(6-amino-9H-purin-9-yl)-N'-(2-hydroxybenzylidene) propanehydrazide. The structures of the ligand (L) and complex (L.Zn) were characterized by UV-VIS, FT-IR, MS, 1 H-NMR and 13 C-NMR. The sensing performance of the proposed chemosensors, L and (L.Zn), towards common ions was investigated via naked-eye studies as well as absorption and emission spectral analysis. Hydrazone (L) efficiently functioned as a fluorescence sensor for Al3+ and Zn2+ ions with large binding constants, and exhibited colorimetric and fluorometric responses for several basic anions: OH- , CO3 2- , HCO3 - , HSO3 - , CH3 COO- and CN- . On the other hand, (L.Zn) showed quick, sensitive and specific enhancement of fluorescence intensity towards CN- anion, and a linear relationship was observed as the concentration of CN- varied from 1 to 14 μM. The detection limit was determined to be 0.14 μM, which is lower than the 1.9 μM maximum value recommended by WHO for drinking water. The practical performance of the sensor was successfully demonstrated using various environmental water samples spiked with cyanide ion.