Abstract

AbstractCyclic octa‐ and decapeptides have been prepared, and their ion selectivity in solvent polymeric membranes was studied. Cyclo(‐LPro‐DLeu‐)5 behaves as an ionophore which selects Mg2+ over Ca2+ by a factor of 100. Cyclo(LPro‐LLeu)5 induces selectivity in membranes for Mg2+ over Li+, Na+ and K+ by a factor of 400, 200 and 10, respectively, while selectivity of Mg2+ over Ca2+ is poor. Some evidence is presented which indicates that certain ionophores exhibit high selectivity for monovalent magnesium complexes.

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