Detection of Hg2+ with NBD-based colorimetric chemosensor: Practical application to water samples and test strips |
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| Authors: | Sumin Jung Sungjin Moon Cheal Kim |
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| Institution: | Department of Fine Chem. and New and Renewable Energy Convergence, SNUT (Seoul National Univ. of Sci. and Tech.), Seoul, South Korea |
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| Abstract: | A new nitrobenzoxadiazole (NBD)-based chemosensor N′-(7-nitrobenzoc]1,2,5]oxadiazol-4-yl)thiophene-2-carbohydrazide ( NTCH) was synthesized for detecting Hg2+. NTCH could sense Hg2+ through a color change method from pale yellow to pink. Binding ratio of NTCH and Hg2+ was determined to be 1:1 with the analysis of electrospray ionization mass spectrometry and Job plot. Detection limit turned out to be 0.69 μM. In addition, NTCH could be successfully utilized for detecting Hg2+ in real water samples and visible color test strips. The probing mechanism of NTCH to Hg2+ was explained with 1H nuclear magnetic resonance (NMR) titration, Job plot, electrospray ionization mass spectrometry (ESI-MS), and theoretical calculations. |
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| Keywords: | colorimetric chemosensor mercury ion NBD test strips water sample |
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