Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 9, Issue 23, Pages 8195-8201Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1ob06519j
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Funding
- Fujian Provincial Natural Science Foundation of China [2008J0148]
- National Natural Science Foundation of China [20702005]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry [LXKQ0802]
- Chinese Ministry of Education [211084]
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A novel chemosensor based on unsymmetrical squaraine dye (USQ-1) for the selective detection of Hg2+ in aqueous media is described. USQ-1 in combination with metal ions shows dual chromogenic and turn-on fluorogenic response selectivity toward Hg2+ as compared to Li+, Na+, K+, Mg2+, Ca2+, Ba2+, Al3+, Cu2+, Cd2+, Mn2+, Fe3+, Ag+, Pb2+, Zn2+, Ni2+ and Co2+ due to the Hg2+-induced deaggregation of the dye molecule. A recognition mechanism based on the binding mode is proposed based on the absorption and fluorescence changes, H-1 NMR titration experiments, ESI-MS study, and theoretical calculations.
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