title: Mercapto thiadiazole-based sensor with colorimetric specific selectivity for AcO- in aqueous solution.
abstract: A novel acetate selective anion sensor 3 based on azophenol and mercapto thiadiazole had been designed and synthesized. Sensor 3 behaves a single selectivity and sensitivity in the recognition for AcO(-) anion over other anions such as F(-), Cl(-), Br(-), I(-), H(2)PO(4)(-), HSO(4)(-) and ClO(4)(-) by naked-eyes and UV-vis spectra changes in aqueous solution (H(2)O/DMSO, 5:5, v/v). The color of the solution containing sensor 3 had an obvious change from colorless to orange only after the addition of AcO(-) in aqueous solution while other anions did not cause obvious color change. (1)H NMR titration results revealed that the binding process includes two steps: (i) hydrogen bonding interactions (for small quantities of acetate) and (ii) proton transfer between the sensor 3 and the coordinated anion (for high quantities of acetate). The association constant K(a) was 7.35×10(3) M(-1). The detection limitation of AcO(-) with the sensor 3 was 1.0×10(-6) mol L(-1).
authors: Key Laboratory of Eco-Environment-Related Polymer Materials, Ministry of Education of China, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu, PR China.
authors: Jun-Qiang
authors: JQ
authors: Li
authors: Tai-Bao
authors: TB
authors: Wei
authors: Qi
authors: Q
authors: Lin
authors: Ping
authors: P
authors: Li
authors: You-Ming
authors: YM
authors: Zhang
mesh_terms: D000085:Acetates / Q000032:analysis*; D000838:Anions / Q000032:analysis*; D003124:Colorimetry / Q000379:methods*; D012680:Sensitivity and Specificity; D012996:Solutions; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D013830:Thiadiazoles / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D000085:Acetates; D000838:Anions; D012996:Solutions; D013438:Sulfhydryl Compounds; D013830:Thiadiazoles; D014867:Water