title: Reaction-based colorimetric and ratiometric fluorescence sensor for detection of cyanide in aqueous media.
abstract: A stilbene-based compound (1) has been prepared and was highly selective for the detection of cyanide anion in aqueous media even in the presence of other anions, such as F(-), Cl(-), Br(-), I(-), ClO(4)(-), H(2)PO(4)(-), HSO(4)(-), NO(3)(-), and CH(3)CO(2)(-). A noticeable change in the color of the solution, along with a prominent fluorescence enhancement, was observed upon the addition of cyanide. The color change was observed upon the nucleophilic addition of the cyanide anion to the electron-deficient cyanoacrylate group of 1. The spectral changes induced by the reaction were analyzed by comparison with two model compounds, such as compound 2 with dimethyl substituents and compound 3 without a cyanoacrylate group. An intramolecular charge-transfer (ICT) mechanism played a key role in the sensing properties, and the mechanism was supported by DFT/TDDFT calculations.
authors.affiliation: Institute of Chemistry, Academia Sinica, Taipei 115, Taiwan.
authors.forename: Yan-Duo
authors.initials: YD
authors.lastname: Lin
authors.forename: Yung-Shu
authors.initials: YS
authors.lastname: Pen
authors.forename: Weiting
authors.initials: W
authors.lastname: Su
authors.forename: Kang-Ling
authors.initials: KL
authors.lastname: Liau
authors.forename: Yun-Sheng
authors.initials: YS
authors.lastname: Wen
authors.forename: Chin-Hsin
authors.initials: CH
authors.lastname: Tu
authors.forename: Chia-Hsing
authors.initials: CH
authors.lastname: Sun
authors.forename: Tahsin J
authors.initials: TJ
authors.lastname: Chow
mesh_terms: D000838:Anions / Q000032:analysis*; D003124:Colorimetry / Q000379:methods*; D003486:Cyanides / Q000032:analysis*; D008958:Models, Molecular; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013267:Stilbenes / Q000737:chemistry*; D014867:Water / Q000032:analysis
chemical_list: D000838:Anions; D003486:Cyanides; D013267:Stilbenes; D014867:Water