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Interlocked Molecules / Supramolecular Polymers

 By introducing a guest moiety into a mono-substituted pillar[n]arenes, we synthesized self-inclusion complexes/supramolecular polymers in which the guest moieties is incorporated in the pillar[n]arene cavity (Figure 1). Interlock molecules have been also synthesized by reaction with pseudo[2]rotaxane with bulky stoppers. We also synthesized neutral pillar[5]arene-based [2]rotaxanes with two equivalent stations connected by various lengths of linear alkyl and oligo(ethylene oxide) spacers, and investigated how the constitution and length of the spacer affect the ring shuttling. Surprisingly, the length of the spacer does not affect the rate of the shuttling of the pillar[5]arene ring. (Fig. 2, Collaboration work with Professor A. M. Brouwer, University of Amsterdam, The Netherlands).

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