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as coupling agent. The fluorescence properties of PVA-HRBH
in solution were evaluated in detail. The selectiveness of PVA-
HRBH to various of metal cations including Ag+, Cd2+, Co2+,
Cu2+, K+, Mg2+, Ba2+, Fe2+, Ni2+, Hg2+, Pb2+, Cr3+, Fe3+ and
Zn2+ were determined. In the presence of these metal cations,
the fluorescence intensity of the polymer was enhanced and
the I/I0 of each cation was different. Moreover, clear color
changes from colorless to pink were observed. The highest
enhancing effect was noticed in the presence of Hg2+ ion. The
results revealed that the aqueous solutions of the polymeric
chemosensor can be used for the colorimetric, fluorogenic
detection, as well as quantification of Hg2+. In particular, it
represents one of the few fluorescent sensors that allow a
selective and sensitive detection of Hg2+ in aqueous medium
without any organic co-solvent required. We believe that
PVA-HRBH can be used for many practical applications in
chemical, environmental and biological systems.
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Acknowledgments We acknowledge financial support from the Na-
tional Natural Science Foundation of China (under Grant No. 21307002).
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