title: Bis-amidocarbazolyl urea receptor for short-chain dicarboxylate anions.
abstract: Urea receptor 1 based on two (1-amino-8-amido-3,6-dichloro)carbazole units shows a strong association with dicarboxylate anions such as oxalate, malonate and succinate guests through multiple hydrogen bonds from the carbazole, urea and amide NH groups. (1)H NMR complexation studies exhibit high values of association constants in DMSO-d(6). X-ray structures of the 1 : 1 complexes of 1 with oxalate and malonate as their ditetrabutylammonium salts were obtained. A modelling study of the complex of receptor 1 with succinate (as its diTBA salt) showed a more reduced geometric complementarity than its homologue malonate.
authors.affiliation: Organic Chemistry Department, University of Salamanca, Plaza de los Caídos 1-5, 37008 Salamanca, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Belén Jiménez
authors.forename: Victoria
authors.initials: V
authors.lastname: Alcázar
authors.forename: Rafael
authors.initials: R
authors.lastname: Peláez
authors.forename: Francisca
authors.initials: F
authors.lastname: Sanz
authors.forename: Angel L
authors.initials: AL
authors.lastname: Fuentes de Arriba
authors.forename: M Cruz
authors.initials: MC
authors.lastname: Caballero
mesh_terms: D000838:Anions / Q000737:chemistry; D002227:Carbazoles / Q000737:chemistry*; D018360:Crystallography, X-Ray; D003998:Dicarboxylic Acids / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D014508:Urea / Q000031:analogs & derivatives / Q000138:chemical synthesis / Q000737:chemistry*
chemical_list: C572224:(1-amino-8-amido-3,6-dichloro)carbazole; D000838:Anions; D002227:Carbazoles; D003998:Dicarboxylic Acids; D014508:Urea