Journal
DYES AND PIGMENTS
Volume 137, Issue -, Pages 601-607Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2016.10.050
Keywords
Si-Rhodamine; B thiolactone; Chemosensor; Long wavelength operating; Mercury ion; Off-on; Naked-eye detection
Funding
- National Natural Science Foundation of China [43410641, 41140032]
- Natural Science Foundation of Liaoning Province of China [201602001]
- Research Fund for the Doctoral Program from Anshan Normal College [2016b03]
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A novel long wavelength operating colorimetric and fluorescent chemosensor, Si-rhodamine B thiolactone (Si-RBS), has been successfully synthesized and characterized. Si-RBS demonstrated high selectivity towards Hg2+ with about 670-fold enhancement in fluorescence emission intensity at 687 nm over various environmentally relevant metal cations such as Ag+, Al3+, Ca2+, Cd2+, Cr3+, Cu2+, Fe3+, K+, Mg-2(+), Mn2+, Ni2+, Pb2+ and Zn2+ in pH 5.2 media. The addition of Hg2+ induced a significant change in color of Si-RBS solution from colorless to light blue, making the naked-eye recognition of mercury ions possible. Importantly, high sensitivity (detection limit down to 0.25 nM) and a rapid response time (<1 min) were noted for the feasibility in real-time quantitative recognition of Hg2+. (C) 2016 Elsevier Ltd. All rights reserved.
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