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Columnar Liquid Crystals from a Giant Macrocycle Mesogen
Author(s) -
Kawano Shinichiro,
Kato Masahiro,
Soumiya Shinya,
Nakaya Masato,
Onoe Jun,
Tanaka Kentaro
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201709542
Subject(s) - mesogen , thermotropic crystal , liquid crystal , crystallography , materials science , moiety , side chain , phase (matter) , chemistry , stereochemistry , liquid crystalline , organic chemistry , polymer , optoelectronics , composite material
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.