Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602, Japan.
Department of Energy Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan.
Angew Chem Int Ed Engl. 2018 Jan 2;57(1):167-171. doi: 10.1002/anie.201709542. Epub 2017 Nov 30.
Columnar liquid crystals composed of a giant macrocyclic mesogen were prepared. The giant macrocyclic mesogen has a square hollow with a 2.5 nm diagonal, which was bounded by diindolo[3,2-b:2',3'-h]carbazole (diindolocarbazole) moieties as the edges and bis(salicylidene)-o-phenylenediamine (salphen) moieties as the corners. The shape and size of the macrocycle were directly observed by scanning tunneling microscopy (STM). Each side of the bright square in the STM image corresponds to a diindolocarbazole moiety, and the length of the sides was consistent with the result of the single crystal analysis of diindolocarbazole. Finally, we successfully obtained a giant macrocycle with long and branched side chains, which exhibited a rectangular columnar LC phase over a wide temperature range. To the best of our knowledge, it contained the largest discrete inner space of any thermotropic columnar liquid crystal composed of macrocyclic mesogens.
我们制备了由巨型大环介晶组成的柱状液晶。该巨型大环介晶具有一个 2.5nm 对角线的方形空腔，由并吲哚[3,2-b:2',3'-h]咔唑（并吲哚咔唑）部分作为边缘，双（水杨醛）-邻苯二胺（水杨醛）部分作为角围成。大环的形状和尺寸通过扫描隧道显微镜（STM）直接观察到。STM 图像中明亮正方形的每一侧对应于一个并吲哚咔唑部分，并且侧面的长度与并吲哚咔唑的单晶分析结果一致。最后，我们成功获得了具有长支链的巨型大环，其在很宽的温度范围内表现出矩形柱状 LC 相。据我们所知，它包含了由大环介晶组成的热致柱状液晶中最大的离散内腔。
