Self-Assembly and Molecular Recognition in Water: Tubular Stacking and Guest-Templated Discrete Assembly of Water-Soluble, Shape-Persistent Macrocycles
作者:Qiuhua Wang、Yulong Zhong、Daniel P. Miller、Xiaoxing Lu、Quan Tang、Zhong-Lin Lu、Eva Zurek、Rui Liu、Bing Gong
DOI:10.1021/jacs.9b11536
日期:2020.2.12
fundamental and practical significance. To examine the role of multiple non-covalent interactions in controlled assembling and binding behavior in water, the self-association of five water-soluble hexakis(m-phenylene ethynylene) (m-PE) macrocycles, along with the molecular recognition behavior of the resultant assemblies, is investigated with UV-vis, fluorescence, CD, and NMR spectroscopy, mass spectrometry
水介质中的超分子化学是一个具有重要基础和实际意义的领域。为了检查多种非共价相互作用在水中受控组装和结合行为中的作用,五种水溶性六(间亚苯基乙炔)(m-PE)大环的自缔合,以及使用紫外-可见光、荧光、CD 和核磁共振光谱、质谱和计算研究对所得组件进行了研究。与它们在有机溶剂中不同程度的自聚集相反,所有五个大环在水中保持聚集,浓度低至微摩尔 (μM) 范围。CD 光谱显示 1-F6 和 1-H6,两个带有手性侧链并能够进行氢键自缔合的大环,组装成管状堆叠。管状堆叠在水中充当超分子主体,例如大环 1-H6 和 2-H6 与客体 G1 至 G4 的相互作用,每个环都有一个棒状的低聚(对亚苯基乙炔)(p-PE)链段由两条亲水链组成。CD、荧光和 1H NMR 光谱揭示了在大环和客体上形成了动力学稳定的离散组件。用荧光、1H NMR 和 ESI-MS 确定的结合化学计量表明离散组件是新型假轮烷,每个都