文献类型：期刊文献

英文题名：A light-powered stretch-contraction supramolecular system based on cobalt coordinated [1]rotaxane

作者：Gao, Chao;Ma, Xiang;Zhang, Qiong;Wang, Qiaochun;Qu, Dahui;Tian, He[1]

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

年份：2011

卷号：9

期号：4

起止页码：1126

外文期刊名：ORGANIC & BIOMOLECULAR CHEMISTRY

收录：;EI(收录号：20110613652918);WOS:【SCI-EXPANDED(收录号:WOS:000286895900025)】；

基金：C. Gao and X. Ma contributed equally to this work. This work is financially supported by National Basic Research 973 Program (2011CB808400), NSFC/China (20972053 & 20802019), X. Ma thanks the support from the Fundamental Research Funds for the Central Universities (WJ0911001), the Ph.D. Programs Foundation of Ministry of Education of China (200802511029) and the 'Chen Guang' project supported by Shanghai Municipal Education Commission and Shanghai Education Development Foundation. C. G. is grateful for discussions with Ms. Ruyi Sun, Mr. Liangliang Zhu.

语种：英文

外文关键词：Molecular electronics - Dichroism - Cobalt compounds - Supramolecular chemistry

摘要：A mechanically switchable bistable [1] rotaxane, constituted of azobenzene modified cyclodextrins (CyDs) and a Schiff base bridged by a metallosalen unit, was designed and synthesized. H-1 NOESY NMR and ICD spectra were investigated to characterize the movement process of this stretch-contraction supramolecular system. The geometries of [1] rotaxane before and after irradiation by UV light were optimized and calculated. Coordinated with cobalt(III) ion, the rotaxane becomes more rigid and linear, which is seen from the more obvious signals in the induced circular dichroism (ICD) and 1H NMR spectra. This type of light-powered [1] rotaxane has favourable repeatability and exhibits a novel approach to elaborate the transformation of a light-driven molecular machine.