Highly selective colorimetric schiff base chemosensor for detection of Cu2+
A highly selective colorimetric chemosensor for Cu2+ has been designed using a novel Schiff base based on 2-hydroxy-1-naphthaldehyde. On addition of Cu2+, the color of Schiff base solution changes from yellow to colorless, which can be viewed with the naked eye. The proposed chemosensor is sensitive to Cu2+ with the detection limit of 1.3×10-7 mol L-1. The mechanism of the colorimetric chemosensor for the detection of Cu2+ has been investigated in detail through UV-vis, Job plot, 1H NMR and FT-IR data. The results show that a stoichiometric complex (1:1) is formed between Schiff base and Cu2+, based on the molecular proton transfer process. The selectively of the chemosensor for detection of Cu2+ over common cations has been investigated by UV-vis spectroscopy. The test strip for Cu2+ prepared according to the principle of colorimetric chemosensor illustrates the advantages of this method in terms of convenience and effectiveness.
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