Multiple-Stimulus-Responsive Supramolecular Gels and Regulation of Chiral Twists: The Effect of Spacer Length
作者:Wangen Miao、Dong Yang、Minghua Liu
DOI:10.1002/chem.201500097
日期:2015.5.11
indicated that the supramolecular chirality, which was attributed to the chiral transfer from the chiral center to the assemblies, was also closely related to the length of methylene spacers. The longer the alkyl spacers, the weaker the transmitted supramolecular chirality. Only LG12‐(CH2)1‐BSA gelators, which had the shortest spacers, formed right‐handed nanoscale chiral twists owing to crowded hydrogen
合成了一类新型的同源胶凝剂LG 12-(CH 2)n -BSA,它由联吡啶基,具有双十二烷基链的L-谷氨酸部分和不同长度的连接的烷基间隔基组成。发现这些胶凝剂可以很容易地固定中极性溶剂,并且这些凝胶的行为表现出对间隔物长度的依赖性。在所有凝胶中,LG 12-(CH 2)11‐BSA凝胶具有自我修复特性,并具有多种刺激作用,例如加热,摇动和超声处理。CD谱的研究表明,超分子的手性,归因于从手性中心到组装体的手性转移,也与亚甲基间隔基的长度密切相关。烷基间隔基越长,所传递的超分子手性越弱。只有间隔最短的LG 12-(CH 2)1 -BSA胶凝剂由于拥挤的氢键相互作用而形成了右旋纳米级手性扭曲。此外,发现高极性溶剂DMF能够轻松调节手性扭曲及其节距。