Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan, 250100, P.R. China.
Chemistry. 2018 Jul 20;24(41):10452-10459. doi: 10.1002/chem.201801321. Epub 2018 Jun 19.
A low-molecular-weight supramolecular hydrogel has been fabricated based on host-guest interactions between β-cyclodextrin (β-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 β-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.
已基于β-环糊精（β-CD）与含有偶氮苯和双（三氟甲烷磺酰基）亚胺的不对称双子离子液体（ZIL）之间的主客体相互作用，构建了一种低分子量超分子水凝胶。光和温度引发了可逆的溶胶-凝胶相转变。通过 NMR 光谱、UV/Vis 光谱、等温热滴定法和对照实验详细研究了水凝胶中的结合化学计量比、主要非共价相互作用、光热响应机制以及包合模式。有趣的是，复合物中的β-CD 可以通过光来操纵，沿着客体分子穿梭，同时伴随圆二色信号的变化。凝胶-溶胶相转变伴随着电导率的可逆切换，这证明了超分子水凝胶的稳定性及其在多刺激响应电传感器材料中的潜在应用。
