Abstract
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•2-(3-ethoxy-4-hydroxybenzylideneamino)-5-hydroxybenzoic acid is prepared.•The above ligand is used as Cu2+ sensor in solution state.•The LOD of was found to be 0.39 μM.
Present work describes the preparation of an imine-based fluorescent on–off sensor probe, 2-(3-ethoxy-4-hydroxybenzylideneamino)-5-hydroxybenzoic acid (EHBA) and characterized by using UV–Visible, ESI-MS, 1H NMR, 13C NMR and FTIR spectral techniques. The binding mode ratio between the chemosensor (EHBA) with Cu2+ metal ions in 1:1 stoichiometric ratio respectively. The synthesized probe demonstrated sensitive and selective detection capability towards Cu2+ ions. Further, the sensor EHBA showed visually change in color in the presence of Cu2+ ions, the solution appeared yellow in color was observed. Besides, the sensor EHBA exhibited an outstanding sensitivity and selectivity exceptionally for Cu2+, while the other remaining various metal ions (Zn2+, Pb2+, Hg2+, Mn2+, Ni2+, Co2+, Fe2+, Cd2+, Cr3+, Al3+, Na+, K+ and Ag+) were remain unchanged. Moreover, a remarkable quenching in the fluorescence intensity was exhibited by the sensor probe EHBA with the addition of Cu2+ ions. It is worth to note that the limit of detection for Cu2+ was found to be 0.39 µM respectively.