简介:Two-armedneutralanionreceptors(4,5),calix[4]arenesbeatingthioureaandamidebindingsites,werepreparedandexaminedtheiranion-bindingabilitybytheUV-visspectra.Theresultsofnon-linearcurvefittingandJobplotindicatethat4or5forms1:1stoichiometrycomplexwithfluoridebyhydrogenbondinginteractions.Receptors4and5haveanexcellentselectivityforfluoridebuthavenobindingabilitywithacetate,dihydrogenphosphateandthehalogenanions(Cl^-,Br^-,I^-).