A Systems Approach to Controlling Supramolecular Architecture and Emergent Solution Properties via Host-Guest Complexation in Water

被引:68
作者
Jiao, Dezhi [1 ]
Biedermann, Frank [1 ]
Tian, Feng [1 ]
Scherman, Oren A. [1 ]
机构
[1] Univ Cambridge, Dept Chem, Melville Lab Polymer Synth, Cambridge CB2 1EW, England
基金
英国工程与自然科学研究理事会;
关键词
CHARGE-TRANSFER COMPLEX; TEMPERATURE IONIC LIQUIDS; AQUEOUS-SOLUTION; PHYSICOCHEMICAL PROPERTIES; CUCURBITURIL HOMOLOGS; IMIDAZOLIUM CATION; SYNTHETIC HOST; BINDING; RECOGNITION; DERIVATIVES;
D O I
10.1021/ja106716j
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The assembly behavior of aryl/alkyl imidazolium ionic liquid salts in aqueous solution has been investigated. These salts undergo self-assembly into one-dimensional stacks via hydrophobic and pi-pi interactions upon increasing concentration, which led to a substantial increase in the solution viscosity in water. Addition of the macrocyclic host molecules cucurbit[n]urils (CB[n]) were found to effectively alter the supramolecular assemblies, as evidenced from the dramatic increase (by CB[7]) and decrease (by CB[8]) in solution viscosity and aggregation size in water, on account of the different binding stoichiometries, 1:1 complexation with CB[7] and 2:1 complexation with CB[8]. Furthermore, the aggregate architectures were controllably modified by competitive guests for the CB[n] hosts. This complex supramolecular systems approach has tremendous implications in the fields of molecular sensor design, nonlinear viscosity modification, and controlled release of target molecules from a defined supramolecular scaffold in water.
引用
收藏
页码:15734 / 15743
页数:10
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