Even better than the real thing? As host molecules, long synthetic nanotubes may be reasonable alternatives to single-walled nanotubes. For example, calixarene-based nanotubes effectively pack into infinite tubular bundles in the solid state (see picture), and they can be easily filled with guest molecules to form stable, but reversible, encapsulation complexes.
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Organo et al. (2005) studied this question.
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