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A side-chain hetero-polypseudorotaxane was prepared from a water-soluble polymer ( 1 ) bearing heptamethylene (C 7 ) and azobenzene (Azo) moieties connected with oligo(ethylene glycol) in the side chain by three steps, in which α- and β-cyclodextrins (α- and β-CDs) included the C 7 and cis -Azo moieties, respectively. In the first step, α-CD was added to 1 to form the side-chain polypseudorotaxane, in which α-CD included both the C 7 and trans -Azo moieties in the side chain. In the second step, the Azo moiety at the end of the side chain was isomerized to the cis isomer to form the side-chain polyrotaxane, in which α-CD was interlocked on the side chain. In the final step, β-CD was added to the side-chain polyrotaxane to form the side-chain hetero-polypseudorotaxane.
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Taura et al. (2010) studied this question.
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