New tetraheterocyclic macrocycles containing triazole, pyrazole, pyridine, and/or furan subunits. Synthesis and cation binding properties

Ten new tetraheterocyclic macrocyclic ligands 2-4 in the porphyrinogen series were prepared. The rigid dipyrazole ditriazole macrocycles 3 extract Na + selectively, whereas the more flexible dipyrazole monotriazole monopyridine macrocycles 2 have the best transport selectivity for Na +