Given the biological importance of organic cations, the facilitated transport of organic ion pairs could find many applications.C alix[6]arene tris(thio)ureas,w hichp ossess ac avity that can accommodate primary ammonium ions,c an not only act as carriers for Cl À /NO 3 À antiport but can also perform the cotransport of PrNH 3 Cl. Transport was monitored by fluorescence spectroscopyand the presence of the different species inside the vesicles was characterized by 1 Ha nd 35 Cl NMR experiments involving shift reagents.The cotransport of PrNH 3 Cl was also observed by receptors deprived of acavity, but the presence of the cavity conveys an advantage,a st he cotransport by calix [6]arenes was observed to be more efficient than the Cl À /NO 3 À antiport, which is not the case with receptors without ac avity.T he role played by the cavity was further highlighted by the disappearance of this advantage when using abulkyammonium ion, whichcannot be complexed within the cavity.
Given the biological importance of organic cations, the facilitated transport of organic ion pairs could find many applications.C alix[6]arene tris(thio)ureas,w hichp ossess ac avity that can accommodate primary ammonium ions,c an not only act as carriers for Cl À /NO 3 À antiport but can also perform the cotransport of PrNH 3 Cl. Transport was monitored by fluorescence spectroscopyand the presence of the different species inside the vesicles was characterized by 1 Ha nd 35 Cl NMR experiments involving shift reagents.The cotransport of PrNH 3 Cl was also observed by receptors deprived of acavity, but the presence of the cavity conveys an advantage,a st he cotransport by calix [6]arenes was observed to be more efficient than the Cl À /NO 3 À antiport, which is not the case with receptors without ac avity.T he role played by the cavity was further highlighted by the disappearance of this advantage when using abulkyammonium ion, whichcannot be complexed within the cavity.
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