Wu Dongxia, Deng Ke, Zeng Qingdao, Wang Chen
Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100080, P. R. China.
J Phys Chem B. 2005 Dec 1;109(47):22296-300. doi: 10.1021/jp053293x.
A host supramolecular structure consisting of bis-(2,2':6',2' '-terpyridine)-4'-oxyhexadecane (BT-O-C16) is shown to respond to guest molecules in dramatic ways, as observed by using scanning tunneling microscopy (STM) on a highly oriented pyrolytic graphite surface under ambient conditions. It is observed that small linear molecules can be encapsulated within the host supramolecular lattice. The characteristics of the host structure were nearly unaffected by the encapsulated guest molecules of terphthalic acid (TPA) dimers, whereas appreciable changes in cavity dimension can be observed with azobenzene-4,4'-dicarboxylic acid. The STM study and density functional theory (DFT) analysis reveal that intermolecular hydrogen bonding interaction plays an essential role in forming the assembling structures. The difference in guest molecule length is considered the important cause for the different guest-host complexes.
在环境条件下，通过在高度定向的热解石墨表面使用扫描隧道显微镜（STM）观察发现，由双（2,2':6',2''-三联吡啶）-4'-氧十六烷（BT-O-C16）组成的主体超分子结构对客体分子有显著响应。可以观察到小的线性分子能够被封装在主体超分子晶格内。主体结构的特征几乎不受对苯二甲酸（TPA）二聚体客体分子的影响，而对于偶氮苯-4,4'-二羧酸，可以观察到空腔尺寸有明显变化。STM研究和密度泛函理论（DFT）分析表明，分子间氢键相互作用在形成组装结构中起着至关重要的作用。客体分子长度的差异被认为是不同客体-主体配合物形成的重要原因。
