Abstract
Cyclic l-lactic acid octamer (l-COLA-8) shows a unique complexing capability towards alkali and alkali earth metal cations in acetonitrile-d3/chloroform-d (9/1). The valence of the cation affects the stoichiometry of the complexes between l-COLA-8 and the cation; l-COLA-8 forms a 2:1 complex with alkali metal cations, but forms a 1:1 complex with alkali earth metal cations. Additionally, l-COLA-8 shows a binding selectivity for Rb+ and Ba2+, which have a diameter about 3Å.
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