title: Colorimetric detection of anions in aqueous media using N-monosubstituted diaminomaleonitrile-based azo-azomethine receptors: real-life applications.
abstract: New N-monosubstituted diaminomaleonitrile-based azo-azomethine dyes have been synthesized in order to develop colorimetric sensors for detection of biologically important anions in aqueous media. Importantly, the reported sensor decorated with strong electron-withdrawing group can detect inorganic fluoride in water even at 0.037 ppm level, which is lower than WHO permissible level (below 1 ppm). Successfully, the prepared dyes were used for qualitative and quantitative detection of inorganic fluoride in toothpaste and mouthwash. The anion recognition mechanism was also investigated by detailed UV-Vis and (1)H NMR experiments. The detailed (1)H NMR experiments corroborated that anion recognition is based on the deprotonation phenomenon.
authors.affiliation: Department of Chemistry, Faculty of Science, Arak University, Arak 38156-8-8349, Iran. Electronic address: h-khanmohammadi@araku.ac.ir.
authors.forename: Hamid
authors.initials: H
authors.lastname: Khanmohammadi
authors.affiliation: Department of Chemistry, Faculty of Science, Arak University, Arak 38156-8-8349, Iran.
authors.forename: Khatereh
authors.initials: K
authors.lastname: Rezaeian
authors.affiliation: Department of Chemistry, Faculty of Science, Arak University, Arak 38156-8-8349, Iran.
authors.forename: Alieh
authors.initials: A
authors.lastname: Abdollahi
mesh_terms: D000838:Anions / Q000032:analysis*; D001391:Azo Compounds / Q000737:chemistry*; D002138:Calibration; D003116:Color; D003124:Colorimetry / Q000379:methods*; D005459:Fluorides / Q000032:analysis; D009067:Mouthwashes / Q000737:chemistry; D009570:Nitriles / Q000737:chemistry*; D066244:Proton Magnetic Resonance Spectroscopy; D013056:Spectrophotometry, Ultraviolet; D013882:Thiosemicarbazones / Q000737:chemistry*; D014100:Toothpastes / Q000737:chemistry; D014867:Water / Q000737:chemistry*
chemical_list: D000838:Anions; D001391:Azo Compounds; D009067:Mouthwashes; D009570:Nitriles; D013882:Thiosemicarbazones; D014100:Toothpastes; C512188:azomethine; D014867:Water; C022103:diaminomaleonitrile; D005459:Fluorides
keywords: Azo-azomethine dyes; Colorimetric sensor; Inorganic fluoride; Real sample; Schiff base