title: p-tert-Butyl thiacalix[4]arenes functionalized at the lower rim by amide, hydroxyl and ester groups as anion receptors.
abstract: New p-tert-butyl thiacalix[4]arenes differently substituted at the lower rim with amide, hydroxyl and ester groups were synthesized. Binding properties of the compounds toward some tetrabutylammonium salts n-Bu(4)NX (X = F(-), Cl(-), Br(-), I(-), CH(3)CO(2)(-), H(2)PO(4)(-), NO(3)(-)) were studied by UV spectroscopy. It was found that the stoichiometry of the complexes, generally, is 1 : 1, and the association constants are in the range of 10(3)-10(5) M(-1). The p-tert-butyl thiacalix[4]arenes containing secondary amide groups trisubstituted at the lower rim bind the studied anions most effectively. Selective receptors for fluoride and dihydrogen phosphate salts of tetrabutylammonium were found.
authors.affiliation: A.M. Butlerov Chemical Institute, Kazan (Volga Region) Federal University, 420008 Kremlevskaya, 18, Kazan, Russian Federation. Ivan.Stoikov@mail.ru
authors.forename: Ivan I
authors.initials: II
authors.lastname: Stoikov
authors.forename: Alena A
authors.initials: AA
authors.lastname: Yantemirova
authors.forename: Roman V
authors.initials: RV
authors.lastname: Nosov
authors.forename: Ildar Kh
authors.initials: IKh
authors.lastname: Rizvanov
authors.forename: Ajdar R
authors.initials: AR
authors.lastname: Julmetov
authors.forename: Vladimir V
authors.initials: VV
authors.lastname: Klochkov
authors.forename: Igor S
authors.initials: IS
authors.lastname: Antipin
authors.forename: Alexander I
authors.initials: AI
authors.lastname: Konovalov
authors.forename: Ilya
authors.initials: I
authors.lastname: Zharov
mesh_terms: D000577:Amides / Q000737:chemistry*; D000838:Anions / Q000737:chemistry; D004952:Esters / Q000737:chemistry*; D006878:Hydroxides / Q000737:chemistry*; D015394:Molecular Structure; D010636:Phenols / Q000737:chemistry*
chemical_list: D000577:Amides; D000838:Anions; D004952:Esters; D006878:Hydroxides; D010636:Phenols; C442852:p-tert-butylthiacalix(4)arene; C031356:hydroxide ion