title: Azocalix[4]arene strapped calix[4]pyrrole: a confirmable fluoride sensor.
abstract: A new chromogenic fluoride sensor based on 1,3-di-p-nitrophenylazocalix[4]arene-calix[4]pyrrole (1) was designed and synthesized. The color of the solution of probe 1 changed upon the addition of any F(-), CH(3)CO(2)(-), PhCO(2)(-), and H(2)PO(4)(-) ions. However, from these ions the highly specific sensing of F(-) is achieved by the addition of Ca(2+) which leads to a color change from light sky blue (of 1·F(-)) back to the original light orange color of 1.
authors.affiliation: Supramolecular Chemistry Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Bangkok 10330, Thailand.
authors.forename: Preecha
authors.initials: P
authors.lastname: Thiampanya
authors.forename: Nongnuj
authors.initials: N
authors.lastname: Muangsin
authors.forename: Buncha
authors.initials: B
authors.lastname: Pulpoka
mesh_terms: D047250:Calixarenes / Q000138:chemical synthesis* / Q000737:chemistry*; D003124:Colorimetry / Q000379:methods; D005459:Fluorides / Q000032:analysis*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D011758:Pyrroles / Q000138:chemical synthesis* / Q000737:chemistry*
chemical_list: C576316:1,3-di-p-nitrophenylazocalix(4)arene-calix(4)pyrrole; D011758:Pyrroles; D047250:Calixarenes; D005459:Fluorides