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-Bu4NX (X= F−, Cl−, Br−, I−, CH3CO2−, H2PO4−, NO3−)
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 103–105 M− 1. The p-tert-
butyl thiacalix [4] arenes containing secondary amide groups trisubstituted at the lower rim …

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-Bu4NX (X= F-, Cl-, Br-, I-, CH 3CO2-, H2PO4-, NO3-) 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 103-105 M-1. The p-tert-butyl
thiacalix [4] arenes containing secondary amide groups trisubstituted at the lower rim bind …