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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.

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Acknowledgments

Financial support from the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF-2015R1A2A2A09001301) is gratefully acknowledged. This work was also supported by Korea Environment Industry & Technology Institute (KEITI) through “The Chemical Accident Prevention Technology Development Project”, funded by Korea Ministry of Environment (MOE) (no. 2016001970001).

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  1. Department of Fine Chemistry and Department of Interdisciplinary Bio IT Materials, Seoul National University of Science and Technology, Seoul, 139-743, Korea

    Min Seon Kim, Seong Youl Lee, Jae Min Jung & Cheal Kim

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  1. Min Seon Kim
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Kim, M.S., Lee, S.Y., Jung, J.M. et al. A new Schiff-base chemosensor for selective detection of Cu2+ and Co2+ and its copper complex for colorimetric sensing of S2− in aqueous solution. Photochem Photobiol Sci 16, 1677–1689 (2017). https://doi.org/10.1039/c7pp00229g

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