Title
Responsive Self‐Assembly of Supramolecular Hydrogel Based on Zwitterionic Liquid Asymmetric Gemini Guest
Author
Aoli Wu, Panpan Sun, Na Sun, Liqiang Zheng
Year
2018
Journal
Chemistry A European Journal
Abstract
Low‐molecular‐weight supramolecular hydrogel was fabricated based on host‐guest interaction between β‐cyclodextrin (β‐CD) and asymmetric Gemini zwitterionic liquid (ZIL) which contains azobenzene (Azo) and bis(trifluoromethanesulfonyl)imide (TFSI‐). Reversible sol‐gel phase transition could be triggered by light and temperature. The binding stoichiometry, main non‐covalent interactions in hydrogel, photo and thermal responsive mechanisms, and inclusion complex mode were studied deeply by NMR spectroscopy, UV‐vis spectroscopy, isothermal titration calorimetry (ITC) and control experiments. Interestingly, the β‐CD in guest molecule can be photo‐manipulated to shuttle accompanied with the change of circular dichroism (CD) signals. The reversible switches of conductivity behind the sol‐gel phase transition indicating the stability of supramolecular hydrogel and their potential applications in multi‐stimuli responsive electric sensor materials.
Instrument
J-810
Keywords
Circular dichroism, Induced circular dichrosim, Cotton effect, Materials