Self-Assembly of Four-Claw Discotic Mesogenic Molecules: Influence of Core on Chirality
Self-Assembly of Four-Claw Discotic Mesogenic Molecules: Influence of Core on Chirality
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四爪盘状介晶分子的自组装：核心对手性的影响
DOI：
10.1021/acs.jpcc.5b03878
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发表时间：
2015-08-13
影响因子：
3.7
通讯作者：
Wang, Chen
中科院分区：
文献类型：
--
作者：
Geng, Yanfang;Chang, Shaoqing;Wang, Chen
分子结构和相互作用决定了自组装膜的形态，对自组装膜的性质起着至关重要的作用。本文报道了两种具有类似的含炔间隔基的四个TP结构，但不同的刚性芳香核芘和咔唑的亚苯基介晶物种的二维自组装研究。利用高分辨扫描隧道显微镜技术，在热解石墨表面观察到了两种稳定的周期性长程超分子网络结构。通过比较研究，揭示了分子结构单元的芳香核对非手性分子在表面上的非手性和手性排列的影响。主链的不对称性导致分子取向，并改变了分子-分子和分子-底物之间的货车范德华力。结果表明，功能分子的设计在构建具有理想结构的二维超分子组装体中起着重要作用。
The morphology of self-assembled monolayers determined by molecular structure and involved interactions plays a crucial role in their properties. Herein, we report a study on 2D self-assembly of two kinds of triphenylene-submitted discotic mesogenic species, which have similar four TP moieties with alkyne spacer but different rigid aromatic cores pyrene and carbazole. Two types of stable periodic long-ranged supramolecular networks on the highly oriented pyrolytic graphite surface have been visualized via high-resolution scanning tunneling microscopy technique. A comparative study reveals how the aromatic core of molecular building blocks affects achiral and chiral arrangement of discotic molecule on surface. The asymmetry backbone results in molecular orientation and varied van der Waals forces between molecule–molecule and molecule–substrate. Our results demonstrate that design of functional molecules plays an important role in the construction of 2D supramolecular assembly possessing desirable structur...