title: Cyanide detection using a benzimidazole derivative in aqueous media.
abstract: A novel cyanide selective fluorescent chemosensor S1 based on benzimidazole group and naphthalene group as the fluorescence signal group had been designed and synthesized. The receptor could instantly detect CN(-) anion over other anions such as F(-), Cl(-), Br(-), I(-), AcO(-), H2PO4(-), HSO4(-), SCN(-) and ClO4(-) by fluorescence spectroscopy changes in aqueous solution (H2O/DMSO, 8:2, v/v) with specific selectivity and high sensitivity. The fluorescence color of the solution containing sensor S1 induced a remarkable color change from pale blue to mazarine only after the addition of CN(-) in aqueous solution while other anions did not cause obvious color change. Moreover, further study demonstrates the detection limit on fluorescence response of the sensor to CN(-) is down to 8.8×10(-8)M, which is far lower than the WHO guideline of 1.9×10(-6)M. Test strips based on S1 were fabricated, which could act as a convenient and efficient CN(-) test kit to detect CN(-) in pure water for "in-the-field" measurement. Thus, the probe should be potential applications in an aqueous environment for the monitoring of cyanide.
authors.affiliation: College of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China.
authors.forename: Jian-Bin
authors.initials: JB
authors.lastname: Li
authors.affiliation: College of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China. Electronic address: hujinghan62@163.com.
authors.forename: Jing-Han
authors.initials: JH
authors.lastname: Hu
authors.affiliation: College of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China.
authors.forename: Juan-Juan
authors.initials: JJ
authors.lastname: Chen
authors.affiliation: College of Chemical and Biological Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Qi
mesh_terms: D000838:Anions / Q000032:analysis; D001562:Benzimidazoles / Q000737:chemistry*; D003486:Cyanides / Q000032:analysis*; D005456:Fluorescent Dyes / Q000737:chemistry*; D057230:Limit of Detection; D013050:Spectrometry, Fluorescence; D014867:Water / Q000737:chemistry
chemical_list: D000838:Anions; D001562:Benzimidazoles; D003486:Cyanides; D005456:Fluorescent Dyes; D014867:Water; C031000:benzimidazole
keywords: Benzimidazole; Cyanide; Fluorescence; Sensors