期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 344, 期 -, 页码 875-882出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2017.11.042
关键词
Fluorescent probe; Water-soluble; Colorimetric; turn-on fluorescence; High sensitivity
资金
- National Natural Science Foundation of China [NSFC 51603177]
- China Postdoctoral Science Foundation [2017M612571]
- Opening Foundation of Creative Platform of the Key Laboratory of the Education Department of Hunan Province, China
A new colorimetric fluorescent probe (MCy) for CN- is designed and synthesized based on triphenylimidazole-hemicyanine dyad. The probe shows high selectivity towards CN- in 100% aqueous solution even in the presence of other competitive anions such as F-, Cl-, AcO-, NO2-, H2PO4-, I-, SCN-, SO42-, NO3-, HCO3-, Br- and S2-. Upon nucleophilic addition of CN- to the indolium group, the probe displays large blue-shift in UV-vis spectrum and remarkable turn-on fluorescence owing to the disruption of intramolecular charge transfer. Meanwhile, the probe also undergoes a naked-eye discernible color change from orange to light pink in the sunlight as well as an obvious fluorescence color change from non-emissive to bright blue under a UV lamp. The detection limit of CN- in aqueous solution can be as low as 20.6 nM, which is much lower than the permissible level of CN- in drinking water according to the WHO. In addition, the probe has been successfully used to determine CN- in real water samples as well as to fabricate test paper kit for CN- detection. (C) 2017 Elsevier B.V. All rights reserved.
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