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A new Schiff-base chemosensor for selective detection of Cu2+ and Co2+ and its copper complex for colorimetric sensing of S2− in aqueous solution

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Abstract

A new Schiff-base colorimetric chemosensor 1 was developed for the detection of Cu2+, Co2+ and S2−. Sensor 1 could simply monitor Cu2+ and Co2+ by a color change from colorless to yellow. The binding modes of 1 to Cu2+ and Co2+ were determined to be a 2 : 1 complexation stoichiometry through Job's plot and ESI-mass spectrometry analysis. The detection limits (0.02 μM and 0.63 μM) for Cu2+ and Co2+ were lower than the recommended values (31.5 μM and 1.7 μM) by the World Health Organization (WHO) for Cu2+ and the Environmental Protection Agency (EPA) for Co2+, respectively. Importantly, 1 could detect and quantify Cu2+ in real water samples. In addition, the Cu2+-2·1 complex could be used as a highly selective colorimetric sensor for S2− in the presence of other anions without any interference. Moreover, the sensing mechanisms of Cu2+ and Co2+ by 1 were explained by theoretical calculations.

Graphical abstract: A new Schiff-base chemosensor for selective detection of Cu2+ and Co2+ and its copper complex for colorimetric sensing of S2− in aqueous solution

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Publication details

The article was received on 21 Jun 2017, accepted on 17 Sep 2017 and first published on 18 Sep 2017


Article type: Paper
DOI: 10.1039/C7PP00229G
Citation: Photochem. Photobiol. Sci., 2017, Advance Article
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    A new Schiff-base chemosensor for selective detection of Cu2+ and Co2+ and its copper complex for colorimetric sensing of S2− in aqueous solution

    M. S. Kim, S. Y. Lee, J. M. Jung and C. Kim, Photochem. Photobiol. Sci., 2017, Advance Article , DOI: 10.1039/C7PP00229G

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