Rack-gear structures in columnar liquid crystal phases of trialkoxybenzyl pentafluorobenzoates and their influences on intercolumnar interdigitation and macroscopic morphologies

In this study, 3,4,5-trialkoxybenzyl pentafluorbenzoates with alkyl chains of various lengths were synthesised, and the phase transition behaviours, liquid crystallinities, and molecular packing structures of their columnar phases were investigated. The results showed that discs comprising two half-...

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Bibliographic Details
Published in:Liquid crystals 2023-01, Vol.50 (2), p.319-330
Main Authors: Kishikawa, Keiki, Nakagomi, Hiromoto, Masuda, Masaya, Suda, Yuto, Ushiki, Ryuji, Yasutake, Mikio, Kohri, Michinari, Taniguchi, Tatsuo
Format: Article
Language:English
Subjects:
Columnar phase
half-discoid molecule
interdigitation
Liquid crystals
macroscopic morphology
Morphology
perfluoroarene-arene interaction
Phase transitions
Phases
Self-assembly
Single crystals
X-ray diffraction
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Summary:In this study, 3,4,5-trialkoxybenzyl pentafluorbenzoates with alkyl chains of various lengths were synthesised, and the phase transition behaviours, liquid crystallinities, and molecular packing structures of their columnar phases were investigated. The results showed that discs comprising two half-discoid molecules stack up to form columns with rack-gear structures, generating columnar liquid crystal phases. From powder and single crystal X-ray diffraction investigation, the mechanism of the self-assembly of molecules into columns and their intercolumnar interdigitation was postulated. Furthermore, it was revealed that the combination of alkyl groups of the benzyl groups was closely related to the type of columnar liquid crystal phases generated and the macroscopic morphologies of the liquid crystal domains.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678292.2022.2142884