Enforced Tubular Assembly of Electronically Different Hexakis(<i>m</i>-Phenylene Ethynylene) Macrocycles: Persistent Columnar Stacking Driven by Multiple Hydrogen-Bonding Interactions
作者:Yulong Zhong、Yi Yang、Yi Shen、Wenwu Xu、Qiuhua Wang、Alan L. Connor、Xibin Zhou、Lan He、Xiao Cheng Zeng、Zhifeng Shao、Zhong-lin Lu、Bing Gong
DOI:10.1021/jacs.7b09647
日期:2017.11.8
having backbones of different electronic properties, are designed to probe the effectiveness of multiple H-bonding interactions in enforcing columnar assemblies. 1H NMR, absorption, fluorescence, and circular dichroism (CD) spectroscopy indicate that, compared with analogous macrocycles that self-associate based on aromatic stacking which is highly sensitive to the electronic nature of the macrocyclic
六(米亚苯基亚乙炔基)(米-PE)的大环化合物1 - 4,共享相同的氢键性侧链,但具有不同电特性的主链,被设计成探测在执行柱状组件多个氢键相互作用的有效性。1 H NMR,吸收,荧光,和圆二色性(CD)光谱法表明,与类似的大环化合物相比,基于芳族堆积自缔这对大环骨架的电子性质高度敏感,大环化合物1 - 4在非极性溶剂中,所有化合物都表现出很强的聚集作用,直至微摩尔(μM)浓度。溶剂极性的增加会迅速减弱聚集。在THF和DMF中,大环以自由分子形式存在。所观察到的溶剂效应,与的行为沿5-F 6,可以通过氢键,请确认氢键起着驱动的自缔合的主导作用不自缔合1 - 4。骨干电子性质并不所述自组装图案共同更改为1 - 4。荧光和CD光谱证实大环1 - 4各向异性地组装,形成螺旋堆叠,其中相邻的分子经历相对旋转,以有利的偏移方式放置各个苯残基。的柱状对准1 - 4原子力显微镜(AFM)证实了这一点,该方