Park Soyoung, Ryu Mi-Hee, Shin Tae Joo, Cho Byoung-Ki
Department of Chemistry and Institute of Nanosensor and Biotechnology, Dankook University, Gyeonggi-Do 448-701, Korea.
Soft Matter. 2014 Aug 21;10(31):5804-9. doi: 10.1039/c4sm00919c. Epub 2014 Jun 30.
In this paper, we report a C3-symmetric liquid crystal (LC) with sixfold alkyl peripheries exhibiting an unusual smectic E-like organization in the LC state. Based on conformational considerations, the smectic assembly is attributed to the formation of an endo-type Y conformer of asymmetric triazolyl and benzylic groups that cannot be accessed in other C3-symmetric molecules exclusively showing columnar assemblies. The Y conformers form a two-dimensional oblique lattice in the aromatic layers of the ordered smectic phase. In addition, the Y-shaped molecule in the smectic phases can change into a circular shape by the 1 : 1 hydrogen-bonding interaction with a gallic acid derivative, which leads to a hexagonal columnar LC phase. The triazole-based LC design concept proves the smectic LC assembly in the C3-symmetric system, and provides the supramolecular manipulation of LC morphologies.
在本文中，我们报道了一种具有六个烷基外围基团的C3对称液晶（LC），其在液晶态表现出一种不寻常的类近晶E组织。基于构象考虑，近晶组装归因于不对称三唑基和苄基基团形成的内型Y构象体，这在其他仅显示柱状组装的C3对称分子中无法实现。Y构象体在有序近晶相的芳香层中形成二维倾斜晶格。此外，近晶相中的Y形分子可通过与没食子酸衍生物的1∶1氢键相互作用转变为圆形，这导致形成六方柱状液晶相。基于三唑的液晶设计概念证明了C3对称体系中的近晶液晶组装，并提供了对液晶形态的超分子操控。
