title: Selective sensing of anions with calix[4]pyrroles strapped with chromogenic dipyrrolylquinoxalines.
abstract: New calix[4]pyrroles bearing dipyrrolylquinoxaline as strapping elements have been synthesized and characterized by spectroscopic means. The binding behavior of these receptors at 25 degrees C was investigated first by proton NMR spectroscopy in CD(3)CN/DMSO-d(6) (9:1 v/v), as well as by UV-vis spectroscopy and isothermal titration calorimetry (ITC) in CH(3)CN/DMSO (97:3 v/v). The receptors displayed a selective colorimetric response when exposed to the fluoride, dihydrogen phosphate, and acetate anions (studied in the form of the corresponding tetrabutylammonium salts) and an enhanced affinity as compared to a comparable calix[4]pyrrole system lacking the dipyrrolylquinoxaline-containing strap.
authors.affiliation: Department of Chemistry and Institute of Basic Science, Kangwon National University, Chun-Chon 200-701 Korea.
authors.forename: Jaeduk
authors.initials: J
authors.lastname: Yoo
authors.forename: Min-Soo
authors.initials: MS
authors.lastname: Kim
authors.forename: Seong-Jin
authors.initials: SJ
authors.lastname: Hong
authors.forename: Jonathan L
authors.initials: JL
authors.lastname: Sessler
authors.forename: Chang-Hee
authors.initials: CH
authors.lastname: Lee
mesh_terms: D000838:Anions / Q000032:analysis*; D047250:Calixarenes / Q000138:chemical synthesis / Q000737:chemistry*; D002151:Calorimetry / Q000379:methods; D003124:Colorimetry / Q000379:methods; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D011166:Porphyrins / Q000138:chemical synthesis / Q000737:chemistry*; D011810:Quinoxalines / Q000138:chemical synthesis / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000838:Anions; D011166:Porphyrins; D011810:Quinoxalines; C469811:calix(4)pyrrole; D047250:Calixarenes