Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 41, Pages 10452-10459Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201801321
Keywords
azo compounds; host-guest systems; hydrogels; supramolecular chemistry; zwitterionic liquids
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Funding
- National Natural Science Foundation of China [21573132, 21773141]
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A low-molecular-weight supramolecular hydrogel has been fabricated based on host-guest interactions between -cyclodextrin (-CD) and an asymmetric gemini zwitterionic liquid (ZIL) containing an azobenzene and bis(trifluoromethanesulfonyl)imide. Reversible sol-gel phase transitions were triggered by light and temperature. The binding stoichiometry, mainly noncovalent interactions in the hydrogel, photo- and thermoresponsive mechanisms, and mode of inclusion in the complex were studied in detail by NMR spectroscopy, UV/Vis spectroscopy, isothermal titration calorimetry, and control experiments. Interestingly, the -CD in the complex can be photo-manipulated to shuttle along the guest molecule, accompanied by a change in the circular dichroism signals. Reversible switching of the conductivity accompanies the sol-gel phase transition, which demonstrates the stability of the supramolecular hydrogel and its potential application in multi-stimuli-responsive electric sensor materials.
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