在极性溶剂中通过多重离子相互作用来进行分子囊的客体封装和自我组装
Francesca Corbellini1, Roberto Fiammengo, Peter Timmerman
1Laboratory of Supramolecular Chemistry and Technology, MESA+ Research Institute, University of Twente P.O. Box 217, 7500 AE Enschede, The Netherlands.
Journal of the American Chemical Society
|June 6, 2002
概括
研究人员使用自组装的相反电荷的体囊创建了新的囊. 这些超分子囊对特定的四级酸盐具有选择性的结合亲和力,在分子识别中具有潜在的应用.
科学领域:
- 超分子化学 超分子化学
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 卡利克萨伦是成熟的宏循环宿主,具有可调节的特性.
- 自组装为构建复杂的超分子架构提供了一个强大的途径.
- 控制充电分子的组合对于设计功能性材料至关重要.
研究的目的:
- 通过自组装报告新型囊的形成和特征.
- 为了研究四胺卡力克斯[4]arenes和四素酸卡力克斯[4]arene之间的自我关联.
- 探索由此产生的超分子组件的结合特性.
主要方法:
- 合成和特征的四胺卡力克斯[4]arenes (1a-d) 和 tetrasulfonato卡力克斯[4]arene (2).
- 包括质子NMR和ESI-MS在内的光谱技术,以确认组件的形成.
- 异热定位热量计 (ITC) 用于量化约束热力学和关联常数.
主要成果:
- 通过相反充电的卡力沙林构建块的自我结合,成功形成了新囊.
- 通过NMR,ESI-MS和ITC证实了组件的1:1石化学证据.
- 快速的,由驱动的关联过程,具有高的关联常数 (Ka ~ 10^6 M^-1).
- 形成的囊系统 (1a.2) 表现出对乙胆,四甲基和N-甲基基酸的结合亲和力.
结论:
- 新型的超分子囊可以通过互补的充电体的静电自组装来高效地构建.
- 由此产生的囊对特定的四级酸盐具有显著的结合亲和力,这表明分子识别应用的潜力.
- 组装过程的快速和驱动的性质凸显了这种超分子策略的效率.
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