title: Squarylium-based chromogenic anion sensors.
abstract: A squarylium (SQ) dye was synthesized by the reaction between squaric acid and 2,3,3-trimethylindolenine and its anion sensing properties were investigated using absorption and emission spectroscopy. This chemosensor exhibited high selectivity for CN(-) as compared with F(-), CH(3)CO(2)(-), Br(-), H(2)PO(4)(-), Cl(-), and NO(3)(-) in acetonitrile, which was attributed to the formation of a 1:1 squarylium:CN(-) coordination complex, the formation of which was supported by the calculated geometry of the complex.
authors.affiliation: BK21 FTIT Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University, Daejeon 305-764, Republic of Korea.
authors.forename: Eun-Mi
authors.initials: EM
authors.lastname: Lee
authors.forename: Seon-Yeong
authors.initials: SY
authors.lastname: Gwon
authors.forename: Young-A
authors.initials: YA
authors.lastname: Son
authors.forename: Sung-Hoon
authors.initials: SH
authors.lastname: Kim
mesh_terms: D000042:Absorption; D000097:Acetonitriles / Q000737:chemistry; D000838:Anions / Q000737:chemistry*; D002863:Chromogenic Compounds / Q000737:chemistry*; D003116:Color; D004396:Coloring Agents / Q000737:chemistry; D003486:Cyanides; D003503:Cyclobutanes / Q000737:chemistry*; D008968:Molecular Conformation; D012996:Solutions; D013057:Spectrum Analysis
chemical_list: D000097:Acetonitriles; D000838:Anions; D002863:Chromogenic Compounds; D004396:Coloring Agents; D003486:Cyanides; D003503:Cyclobutanes; D012996:Solutions; C030042:squaric acid; C032159:acetonitrile