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Abstract
Based on Rhodamine, two novel fluorescent Hg2+ chemosensors(R1, R2) were synthesized from inexpensive starting materials. They were designed and synthesized with o-aminophenol and o-phenylenediamine derivatives as the Hg2+ chelator, the comparison between the photophysical properties of two chemosensor molecules was made. The chemosensors were designed with a photoinduced electron transfer(PET) mechanism. After binding to Hg2+ which blocks the PET process, the fluorescence intensity of the chemosensors was enhanced by up to 15-fold. They exhibit very strong fluorescence responses to Hg2+ and have remarkably higher selectivity for Hg2+ than for other metal ions including K+, Na+, Ca2+, Mg2+, Cd2+, Mn2+, Ni2+, Co2+, Zn2+, Cu2+, Cr3+, Fe3+, Pb2+, Ag+, Al3+, Fe2+ and Sn2+ in Tris-HCl/sodium phosphate buffer. The fluorescence enhancement of R2 towards Hg2+ maintains stable in wide pH span(6.4–8.8) aqueous solutions.
Keywords
Fluorescent chemosensor
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Mercury ion
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Sensor
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Rhodamine fluorophore
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Fluorescence intensity
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Wen-qi Su, Bing-qin Yang.
Novel highly selective fluorescent chemosensors for Hg(II).
Chemical Research in Chinese Universities, 2013, 29(4): 657-662 DOI:10.1007/s40242-013-2363-9
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