Synthetic Ion Channels with Rigid-Rod π-Stack Architecture that Open in Response to Charge-Transfer Complex Formation

Abstract
We describe the design, synthesis, and evaluation of synthetic ion channels with a new rigid-rod π-stack architecture that open in response to guest binding by aromatic electron donor−acceptor interactions. Highly cooperative and highly selective ligand gating is shown to yield anion selective, small ion channels that have the characteristic plum color of the charge-transfer complexes formed between the dialkoxynaphthalene ligands and the stacked naphthalenediimide acceptors of the channel.

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