[摘要]：Efficient access to bis(imidazolyl)calixarene and dicationic bis(imidazolium) salts directly bonded to the upper rim of calixarene structure has been reported. Anion binding properties of the new receptors were studied by 1H NMR spectroscopic methods. Bis(N-butylimidazolium) dication I?PF6 exhibited the best recognition properties toward carboxylate anions with a 1:1 receptor-anion binding stoichiometry, whereas the presence of a bulky group such as iso-Pr (II?PF6) increased the difficulty of both imidazolium moieties to be able to support the assocn. with the same single anion.
