Chiral pinwheel clusters lacking local point chirality.
Chiral pinwheel clusters lacking local point chirality.
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DOI：
10.1002/smll.201200168
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发表时间：
2012-07
期刊：
影响因子：
13.3
通讯作者：
K. Sun;Ting-Na Shao;Jia-Le Xie;Meng Lan;Hongkuan Yuan;Zuhong Xiong;Junzhong Wang;Y. Liu;
中科院分区：
文献类型：
--
作者：
K. Sun;Ting-Na Shao;Jia-Le Xie;Meng Lan;Hongkuan Yuan;Zuhong Xiong;Junzhong Wang;Y. Liu;
超分子风车团簇是一种独特的手性结构，具有明显的利手性。以往的研究表明，手性风轮是由带有极性基团的手性或非手性分子组成的，这导致了分子间强烈的相互作用，如氢键或偶极相互作用。结果表明，由于分子间相互作用的增强，简单的线型芳香族分子并五苯可以在半金属铋(111)表面自组装成大的手性风车团簇。并五烯风轮揭示了两个层次的组织手性：手性六聚体沿分子长轴不对称移动产生的手性六聚体和六个具有旋转体基元的手性六聚体排列。此外，还发现了局域点手性和组织手性之间的一种新关系：在并五苯分子的二维风轮团簇中，前者不是组织手性所必需的。
The supramolecular pinwheel cluster is a unique chiral structure with evident handedness. Previous studies reveal that the chiral pinwheels are composed of chiral or achiral molecules with polar groups, which result in strong intermolecular interactions such as hydrogen-bonding or dipole interactions. Herein, it is shown that the simple linear aromatic molecule, pentacene, can be self-assembled into large chiral pinwheel clusters on the semimetal Bi(111) surface, due to enhanced intermolecular interactions. The pentacene pinwheels reveal two levels of organizational chirality: the chiral hexamers resulting from asymmetric shifting along the long molecular axis, and chiral arrangement of six hexamers with a rotor motif. Furthermore, a new relation between the local point chirality and organizational chirality is identified from the pinwheels: the former is not essential for the latter in 2D pinwheel clusters of the pentacene molecule.