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Abstract | Cited by

Aromatic oligoureas 3 and 4 have urea moieties engaging in weak intramolecular H-bonding that constrains their backbones. The shorter 3a and 3b are able to bind chloride and acetate but not their corresponding counterion. The longer 4 binds both an anion and its counterion with the same affinity.

Graphical abstract: Aromatic oligureas as hosts for anions and cations

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