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Polyether“crown”compoundsareofmuchrecentinterestbecauseoftheirremarkablemetal-ionselectivity[1].Toachievethediscriminationbetweenparticularmetalionsbytheco-ordinationpreferencesofmacrocycle,wehavedesigneddifferenttypesofmacrocyclic“crown”ligands[2][3].Int