Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 185, Issue -, Pages 173-178Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2017.05.053
Keywords
Fluoride ion; Chemosensor; Naphthalene benzimidazole; Fluorescence quenching; Desilylation reaction
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Funding
- National Natural Science Foundation of China [21501066]
- Key R&D Program of Shandong Province [2016GGX107006]
- Shandong Provincial Natural Science Foundation, China [ZR2015BL009]
- Opening Project of Shanghai Key Laboratory of Chemical Biology
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A novel naphthalene benzimidazole (NBI)-based chemosensor (D2) was developed for fluoride ion (F-) detection. The absorption spectrum of D2 changed dramatically from yellow to blue in the visible region accompanied with a 225 nm red shift of its absorption maximum upon the addition of F- in DMSO. D2 also exhibited a fluorescence turn-off response towards the fluoride ion. The emission intensity of D2 decreased drastically along the increasing F- concentration and the detection limit for F- was as low as 3.2 x 10(-9) mol/L. H-1 NMR and HRMS-ESI results indicated that the formation of NBI-O- through the desilylation reaction of F- with NBI-OSi was responsible for the spectral changes. Overall, this kind of NBI-type molecules represent a new type chemosensor for the spectral detection of fluoride ion in solution. (C) 2017 Elsevier B.V. All rights reserved.
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