How about a different geometry? Depending on the reaction conditions, a threefold-symmetric triamine is observed to assemble into either the novel icosahedral [FeII12L12] capsule 1, or tetrahedral [FeII4L4] capsule 2. The two capsules have radically different cavity volumes and shapes, and are able to encapsulate guests of different size, shape, and charge.
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Bilbeisi et al. (2013) studied this question.
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