文献类型：期刊文献

英文题名：A light-driven pseudo[4]rotaxane encoded by induced circular dichroism in a hydrogel

作者：Ma, Xiang[1]; Wang, Qiaochun[1]; Qu, Dahui[1]; Xu, Yun[1]; Ji, Fengyuan[1]; Tian, He[1]

机构：[1]E China Univ Sci & Technol, Adv Mat Lab, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China

年份：2007

卷号：17

期号：5

起止页码：829

外文期刊名：ADVANCED FUNCTIONAL MATERIALS

收录：;EI(收录号：20071610555177);WOS:【SCI-EXPANDED(收录号:WOS:000245685300017)】；

语种：英文

外文关键词：Conformations - Cyclodextrins - Molecular structure - Synthesis (chemical) - Thin films

摘要：A light-driven pseudo[4]rotaxane 1, based on alpha-cyclodextrin (alpha-CyD) and cucurbit[7]uril (CB[7]), is prepared in an easy and convenient manner. The reference pseudo[2]rotaxane 2 and pseudo[3]rotaxane 2' are obtained via the insertion of alpha-CyD and CB[7] onto the dumbbell 3, thus including an azobenzene unit and two viologen moieties, respectively. The CyD macrocycle in pseudo[4]rotaxane 1 can be photochemically stimulated to shuttle accompanied with obvious induced circular dichroism (ICD) signals. The ICD performances of these pseudorotaxanes, including ICD in aqueous solution, variable-temperature ICD, ICD in confected hydrogel systems and in solid-state films, are investigated for their conformational identification. The photo-driven shuttling of the CyD macrocycle in pseudo[4]rotaxane 1 is easier than in the CyD-based psuedo[2]rotaxane 2, especially in non-solution media. This can be attributed to the space exploitation of CB[7]-included parts, which aid the movement of alpha-CYD.