A naphthalene benzimidazole-based chemosensor for the colorimetric and on-off fluorescent detection of fluoride ion

作者：Li, Dongmei; Zhong, Zhimin; Zheng, Gengxiu; Tian, Zhongzhen^*

来源：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2017, 185: 173-178.

DOI：10.1016/j.saa.2017.05.053

• Fluoride ion
• Chemosensor
• Naphthalene benzimidazole
• Fluorescence quenching
• Desilylation reaction

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.

• 出版日期2017-10-5
• 单位济南大学