An unexpected twist: Three chiral amidine-functionalized strands and two benzenetricarboxylic acid molecules self-assemble into a 3:2 cylindrical complex with controlled helicity through amidinium–carboxylate salt-bridge formation. A related 4:2 cylindrical complex composed of two zinc porphyrin units and four chiral strands twists into one direction upon encapsulation of 4,4′-bipyridine through coordination to the zinc centers (see picture).
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Katagiri et al. (2007) studied this question.
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