title: Colorimetric cyanide detection using an azobenzene acid in aqueous solutions.
abstract: An azo-based dye (I) was designed for the detection of cyanide by utilizing a new indirect method. In the presence of Cu(II), compound I could give rise to visible red-to-yellow color change. The resultant yellow solution could change to red immediately upon the addition of trace cyanide, with the detection limit of 0.15 ppm, but no changes were observed in the presence of other anions, including Cl(-), I(-), IO(3)(-), SO(4)(2-), NO(2)(-), Br(-), H(2)PO(4)(-), F(-), SCN(-), HSO(4)(-), ClO(4)(-) and CN(-), making compound I a selective and sensitive cyanide chemosensor.
authors.affiliation: Department of Chemistry, Hubei Key Laboratory on Organic and Polymeric Optoelectronic Materials, Wuhan University, Wuhan, 430072, China.
authors.forename: Xiaoding
authors.initials: X
authors.lastname: Lou
authors.forename: Jingui
authors.initials: J
authors.lastname: Qin
authors.forename: Zhen
authors.initials: Z
authors.lastname: Li
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D003124:Colorimetry / Q000379:methods*; D004396:Coloring Agents / Q000737:chemistry*; D003486:Cyanides / Q000032:analysis* / Q000737:chemistry; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet; D014867:Water / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D003486:Cyanides; D012996:Solutions; D014867:Water; C009850:azobenzene