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A visible chemosensor based on carbohydrazide for Fe(II), Co(II) and Cu(II) in aqueous solution

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Abstract

A colorimetric sensor with pyridyl and carbohydrazide components has been synthesized and visibly turns blue in the presence of Fe(II). The colorless sensor also changes color when exposed to Co(II) and Cu(II), but its color becomes yellow. The sensor shows no visible response to other metal ions such Ca2+, Cr3+, Mn2+, Fe3+, Ni2+, Zn2+, Cd2+, Ag+, Hg2+, and Pb2+. The binding ratio of the sensor to Fe(II), Co(II), and Cu(II) is 2 sensors to 1 metal ion. The binding constants of the sensor are: Fe(II): 1.0 × 109 M−2, Co(II): 2 × 109 M−2, and Cu(II): 3.0 × 109 M−2. The sensor works well at neutral pH and micromolar concentrations of Fe(II), Co(II), and Cu(II) can be detected in water samples. The sensor’s color response to Cu(II) is uniquely attenuated by glutathione.

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Authors and Affiliations

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

    Minuk Yang, Ju Byeong Chae & Cheal Kim

  2. Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, 84602, USA

    Roger G. Harrison

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  1. Minuk Yang
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  2. Ju Byeong Chae
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Correspondence to Cheal Kim.

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Electronic supplementary information (ESI) available: UV-vis spectra of the sensor and metals with the sensor; Job plots of Fe(II), Co(II), and Cu(II) with the sensor; absorption spectra of the sensor and Cu(II); an absorption plot of the sensor with Cu(II) and other metal ions; calculated excitation energies and orbital diagrams; and reusable plots of Fe(II) and Co(II). See DOI: 10.1039/c8pp00545a

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Yang, M., Chae, J.B., Kim, C. et al. A visible chemosensor based on carbohydrazide for Fe(II), Co(II) and Cu(II) in aqueous solution. Photochem Photobiol Sci 18, 1249–1258 (2019). https://doi.org/10.1039/c8pp00545a

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