文献类型：期刊文献

英文题名：Photolockable Ratiometric Viscosity Sensitivity of Cyclodextrin Polypseudorotaxane with Light-Active Rotor Graft

作者：Zhu, Liang-Liang[1,3];Li, Xin[1,2,3];Ji, Feng-Yuan[1,3];Ma, Xiang[1,3];Wang, Qiao-Chun[1,3];Tian, He[1,3]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]Royal Inst Technol, Sch Biotechnol, S-10691 Stockholm, Sweden;[3]E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China

年份：2009

卷号：25

期号：6

起止页码：3482

外文期刊名：LANGMUIR

收录：;EI(收录号：20091812065369);WOS:【SCI-EXPANDED(收录号:WOS:000264145000027)】；

基金：This work was supported by NSFC/China (50673025, 20603009), National Basic Research 973 Program (2006CB806200), Key Project of Chinese Ministry of Education (107044), and Scientific Committee of Shanghai.

语种：英文

外文关键词：Grafting (chemical) - Fluorophores - Cyclodextrins - Irradiation - Locks (fasteners)

摘要：A prototype, based on light-active fluorescent rotor grafted to beta-cyclodextrin, shows a good solvent viscosity-sensitive behavior due to the environment-dependent nonradiative decay. With the reversible photoisomerization of the cyanostilbene unit, the viscosity sensitivity of the molecular rotor could be locked and activated, and the two switchable states can be distinguished by fluorescent signals. This cyclodextrin derivative was threaded to form a novel polypseudorotaxane. Such supramolecular assembly displays a lockable ratiometric fluorescent viscosity sensitivity with two emission channels: one aroused by fluorophore's intramolecular excimer without influenced by viscosity is used to gauge the concentration of the compound, while the other corresponding to the monomer's rotor fluorescence acts as a viscosity-sensitive signal and it can be shut off by UV irradiation.