Like peas in a pod: X-ray crystallography reveals a self-assembled nanotube of cyclic porphyrin dimers and its inclusion complex with C60 (see picture, N blue, Ni green). The cyclic molecules stack through nonclassical CH⋅⋅⋅N hydrogen bonds and π–π interactions of pyridyl groups to form the tubular structure. The C60 molecules are linearly arranged to form a supramolecular peapod.
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Nobukuni et al. (2007) studied this question.
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