A highly selective and sensitive fluorescein-based chemodosimeter for Hg2+ ions in aqueous media |
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Authors: | Yang Xiao-Feng Li Yu Bai Quan |
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Institution: | a Department of Chemistry, Northwest University, Xi’an 710069, China b Institute of Modern Separation Science, Kay Lab of Modern Separation Science in Shaanxi Province, Northwest University, Xi’an 710069, China |
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Abstract: | A new fluorescein-based chemodosimeter (II) for Hg2+ ion was designed and synthesized, and it displayed excellent selective and sensitive toward Hg2+ ion over other commonly metal ions in aqueous media. II was a colorless, non-fluorescent compound. Upon addition of Hg2+ to the solution of II, the thiosemicarbazide moiety of II would undergo an irreversible desulfurization reaction to form its corresponding oxadiazole (IV), a colorful and fluorescent product. During this process, the spirocyclic ring of II was opened, causing instantaneous development of visible color and strong fluorescence emission in the range of 500-600 nm. Based on the above mechanism, a fluorogenic Hg2+-selective chemodosimeter was developed. The fluorescence increase is linearly with Hg2+ concentration up to 1.0 μmol L−1 with a detection limit of 8.5 × 10−10 mol L−1 (3σ). Compared with the rhodamine-type chemodosimeter, II is more stable in aqueous media and exhibits higher sensitivity toward Hg2+. The findings suggest that II will serve as a practical chemodosimeter for rapid detection of Hg2+ concentrations in realistic media. |
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Keywords: | Hg2+ Fluorescein Chemodosimeter Fluorimetry |
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