Abstract
Abstract – A macrocycle ( 2 ) based on xanthone units and diphenylethylenediamine is shown to present strong affinity for chloride ion; the extraction of sodium chloride from water to chloroform is possible in the presence of ( 2 ) and 18-crown-6 ether. Carboxylates also show strong affinities for ( 2 ) in MeOH, but no significant chiral recognition was detected for either naproxenate or ibuprofenate. Zwitterionic amino acids are also extracted from water to chloroform in the presence of 18-crown-6 ether. A modest degree of chiral discrimination was observed for phenylalanine, phenylglycine and t - leucine. INTRODUCTION Although receptors for cations can be found extensively throughout the literature, the study for anion receptors has been started more recently, but has already shown promising results. 1 Positively charged compounds are obvious recept ors for anions, ne vertheless neutral compounds capable to establish H-bonds, 2 like ureas, 3 can also be used to associate anions, and they offer many advantages. Cleft type receptors based on xanthones
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