Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, United Kingdom.
J Am Chem Soc. 2010 Nov 10;132(44):15734-43. doi: 10.1021/ja106716j.
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 π-π 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.
已研究了芳基/烷基咪唑鎓离子液体盐在水溶液中的组装行为。这些盐在浓度增加时通过疏水和π-π相互作用自组装成一维堆叠，从而导致水溶液的粘度大幅增加。发现添加大环主体分子葫芦[n]脲（CB[n]）可有效改变超分子组装，这可以从水溶液的粘度和聚集尺寸的显著增加（由 CB[7]）和降低（由 CB[8]）看出，这是由于不同的结合化学计量，与 CB[7]形成 1:1 配合物，与 CB[8]形成 2:1 配合物。此外，通过竞争客体对 CB[n]主体进行了可控的聚集结构修饰。这种复杂的超分子体系方法在分子传感器设计、非线性粘度修饰以及从水中定义的超分子支架上控制目标分子释放等领域具有重要意义。
