A trisphosphonate and various triammonium and trisamidinium compounds, all containing a C3 axis of symmetry, form strong 1:1 complexes in methanol and water. The structural information about these complexes is best explained in terms of self-assembly by means of a cyclic array of alternating charges resulting in the geometrical shape of a molecular capsule.
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Grawe et al. (2000) studied this question.
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