Photoregulated Switching of the Recognition Site of α-Cyclodextrin in a Side Chain Polyrotaxane Bearing Two Recognition Sites Linked with Oligo(ethylene glycol)
✍ Scribed by Jie Hu; Akihito Hashidzume; Akira Harada
- Publisher
- John Wiley and Sons
- Year
- 2011
- Tongue
- English
- Weight
- 440 KB
- Volume
- 212
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Abstract
A side chain polyrotaxane bearing photoresponsive and nonresponsive recognition sites, i.e., azobenzene (Azo) and heptamethylene (C7) moieties, respectively, linked with a long linker is synthesized. The photoregulated switching of the position of the rotor, i.e., α‐cyclodextrin (α‐CD), in the side chain polyrotaxane is demonstrated by two dimensional rotating frame Overhauser effect spectroscopy and circular dichroism spectroscopy: α‐CD includes the Azo moiety before UV irradiation, whereas α‐CD includes the C7 moiety after trans‐to‐cis photoisomerization of the Azo moieties. magnified image