Ungar Goran, Liu Yongsong, Zeng Xiangbing, Percec Virgil, Cho Wook-Dong
Department of Engineering Materials, University of Sheffield, Sheffield S1 3JD, UK.
Science. 2003 Feb 21;299(5610):1208-11. doi: 10.1126/science.1078849.
Self-organized supramolecular organic nanostructures have potential applications that include molecular electronics, photonics, and precursors for nanoporous catalysts. Accordingly, understanding how self-assembly is controlled by molecular architecture will enable the design of increasingly complex structures. We report a liquid crystal (LC) phase with a tetragonal three-dimensional unit cell containing 30 globular supramolecular dendrimers, each of which is self-assembled from 12 dendron (tree-like) molecules, for the compounds described here. The present structure is one of the most complex LC phases yet discovered. A model explaining how spatial arrangement of self-assembled dendritic aggregates depends on molecular architecture and temperature is proposed.
自组装超分子有机纳米结构具有潜在应用,包括分子电子学、光子学以及纳米多孔催化剂的前体。因此,了解分子结构如何控制自组装将有助于设计日益复杂的结构。对于本文所述的化合物,我们报道了一种具有四方三维晶胞的液晶(LC)相,该晶胞包含30个球状超分子树枝状大分子,每个树枝状大分子由12个树枝状(树状)分子自组装而成。目前的结构是迄今发现的最复杂的液晶相之一。本文提出了一个模型,用以解释自组装树枝状聚集体的空间排列如何取决于分子结构和温度。