title: A new ratiometric and colorimetric chemosensor for cyanide anion based on coumarin-hemicyanine hybrid.
abstract: A hybrid coumarin-hemicyanine dye, Cou-BT, was developed as a new ratiometric and colorimetric sensor for cyanide with a sensing mechanism via nucleophilic addition of cyanide anion to the benzothiolium group. Cou-BT shows high sensitivity and selectivity for cyanide detection over other common anion species in aqueous acetonitrile solution. The calculated pseudo-first-order rate constant for cyanide anion addition was (2.13 ± 0.08) × 10(-2) s(-1) at 298 K, and the detection limit was estimated to be 0.64 μM. The DFT and TDDFT calculation results suggest that the ratiometric and colorimetric sensing behavior of Cou-BT upon its reaction with cyanide was due to the interrupted π-conjugation and blocked ICT progress.
authors.affiliation: State Key Laboratory of Coordination Chemistry, Coordination Chemistry Institute, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, P.R. China.
authors.forename: Zhenghao
authors.initials: Z
authors.lastname: Yang
authors.forename: Zhipeng
authors.initials: Z
authors.lastname: Liu
authors.forename: Yuncong
authors.initials: Y
authors.lastname: Chen
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Wang
authors.forename: Weijiang
authors.initials: W
authors.lastname: He
authors.forename: Yi
authors.initials: Y
authors.lastname: Lu
mesh_terms: D000838:Anions / Q000032:analysis; D003124:Colorimetry / Q000379:methods*; D004396:Coloring Agents / Q000737:chemistry*; D003374:Coumarins / Q000737:chemistry*; D003486:Cyanides / Q000032:analysis*; D008958:Models, Molecular; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence / Q000379:methods; D013053:Spectrophotometry / Q000379:methods
chemical_list: D000838:Anions; D004396:Coloring Agents; D003374:Coumarins; D003486:Cyanides; C030123:coumarin