A new class of cryptand-like ionophore based on a bis calixarene structure has been developed. These molecules proved highly selective for complexation of potassium over all group I metal cations and barium. A range of symmetric and asymmetric calixtubes featuring either alkyl or phenyl substituents at the upper rim have been synthesized in exceptional yield. Alteration of the calixarene upper rim environment enables fine-tuning of the rate of potassium uptake, which can be evaluated...Expand abstract
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Calixtubes: a new class of potassium-selective ionophore.
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