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- Title
Columnar Liquid Crystals from a Giant Macrocycle Mesogen.
- Authors
Kawano, Shin‐ichiro; Kato, Masahiro; Soumiya, Shinya; Nakaya, Masato; Onoe, Jun; Tanaka, Kentaro
- Abstract
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.
- Subjects
LIQUID crystal synthesis; MACROCYCLIC compound synthesis; CARBAZOLE derivatives; MESOGENS; SCANNING tunneling microscopy
- Publication
Angewandte Chemie, 2018, Vol 130, Issue 1, p173
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201709542