文献类型：期刊文献

英文题名：Light-Driven Linear Helical Supramolecular Polymer Formed by Molecular-Recognition-Directed Self-Assembly of Bis(p-sulfonatocalix[4]arene) and Pseudorotaxane

作者：Sun, Ruyi[1,2,3];Xue, Chenming[1];Ma, Xiang[1,2,3];Gao, Min[1];Tian, He[2,3];Li, Quan[1]

机构：[1]Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA;[2]E China Univ Sci & Technol, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[3]E China Univ Sci & Technol, Inst Fine Chem, Shanghai 200237, Peoples R China

年份：2013

卷号：135

期号：16

起止页码：5990

外文期刊名：JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

收录：;EI(收录号：20131816292519);WOS:【SCI-EXPANDED(收录号:WOS:000318204800015)】；

基金：Q.L. thanks the National Science Foundation (NSF IIP 0750379) and the Department of Energy (DOE DE-SC0001412). H.T. thanks the National Natural Science Foundation of China (21190033 & 21272072) and the National Basic Research Program of China (973 Program). Financial support from the China Scholarship Council (CSC) for the research by R.S. at Kent State University is acknowledged. TEM data were obtained at the (cryo-)TEM facility at the Liquid Crystal Institute at Kent State University, which is supported by the Ohio Research Scholars Program Research Cluster on Surfaces in Advanced Materials.

语种：英文

外文关键词：Circular dichroism spectroscopy - Ultraviolet spectroscopy - Dichroism - High resolution transmission electron microscopy - Dynamic light scattering - Molecules - Stereochemistry - Molecular recognition - Nuclear magnetic resonance spectroscopy - Scanning electron microscopy - Self assembly

摘要：A light-driven, linear, chiral supramolecular polymer was constructed in water by host-guest molecular recognition between bis(p-sulfonatocalix[4]arene) and the alpha-cyclodextrin-based pseudo[3]rotaxane containing axially chiral 1,1'-binaphthyl and photoresponsive azobenzene moieties. The successful supramolecular polymerization by non-covalent host-guest molecular recognition was confirmed by H-1 NMR spectroscopy and dynamic light scattering (DLS) measurements, and its photoresponsive behavior was investigated by UV-vis absorption spectroscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), and transmission electron microscopy (TEM). The chirality of this supramolecular polymer was confirmed by circular dichroism spectroscopy. The dramatic morphology change of this chiral polymer driven by light was observed in SEM, AFM and TEM images. More interestingly, dynamically self-assembled, light-driven, single-helical linear supramolecular polymer molecules with lengths of hundreds of nanometers to micrometers in water were directly observed in their native state using cryo-TEM measurements. The observation of considerably lengthy individual supramolecular polymer molecules indicates that the molecular self-assembly in water by non-covalent host-guest molecular recognition is sufficiently strong to form the supramolecular polymer. Moreover, preliminary molecular modeling was performed to substantiate this interesting photoresponsive supramolecular structure.