期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 217, 期 -, 页码 27-34出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2019.03.063
关键词
Ratiometric; Fluorescence; Colorimetric; Probe; Cyanide anion
类别
资金
- National Natural Science Foundation of China [21475080]
- Shanxi Scholarship Council of China [2017-Key1]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
A simple naphthopyran derivative (L) has been synthesized as a colorimetric and ratiometric fluorescent probe for cyanide sensing in the aqueous DMSO medium and paper strips. The nucleophilic addition of CN- to this probe blocks the pi-conjugation and the intramolecular charge transfer (ICT) transition between naphthopyran and benzoindolium moieties and consequently results in remarkable color and spectral changes. Upon addition of cyanide, L displayed a ratiometric fluorescence response with a blue shift of the peak position and a noticeable color change from fuchsia to colorless within 90 s. The probe exhibits high selectivity and sensitivity toward CN- over other anions and the detection limit was calculated to be 7.56 x 10(-7) M, which is well below the WHO cyanide standard in drinking water (1.9 mu M). In addition, the excitation and emission of the probe were within the visible wavelength range, which could benefit an application of the probe in an inexpensive portable cyanide sensor. The sensing ability of L has been successfully applied in real water samples. Furthermore, test strips based on L were fabricated, which can act as convenient and efficient test kits for detecting CN-. (C) 2019 Elsevier B.V. All rights reserved.
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