A highly selective and ratiometric fluorescence probe for the detection of Hg and pH change based on coumarin in aqueous solution |
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| Authors: | Shouhai Yang Wenge Yang Qirun Guo Tuan Zhang Keyi Wu Yonghong Hu |
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| Institution: | 1. College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, No. 200, North Zhongshan Road, Nanjing 210009, China;2. Jiangsu Engineering Technology Research Center of Polypeptide Pharmaceutical, Nanjing 210038, China |
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| Abstract: | A simple but highly selective coumarin-based fluorescence probe 1, 8-(1,3-dithiane)-7-hydroxycoumarin was designed and synthesized for both the ratiometric detection of Hg2+ and the on–off response to pH change in aqueous solution. The sensor detected Hg2+ selectively via Hg2+-promoted thioacetal deprotection reaction within five minutes and reflected pH in the range from 7.8 to 11.9 as a result of the equilibrium between weak-fluorescent acid form and strong-fluorescent base form. In addition, the probe has an excellent selectivity towards Hg2+ over other competitive metal ions for biomedical and environmental applications. The sensing behavior of our probe was studied by UV–visible absorption spectra and fluorescence spectra. |
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| Keywords: | Coumarin Thioacetal Fluorescence quenching Hg2+ pH |
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