Polar smectic phases in quasi-bent-core liquid crystals with hockey-stick-shaped mesogen: synthesis and crossover mesomorphism

New hockey-stick-shaped liquid crystals (HSLCs) have been designed and synthesised. By extreme shortening of one 'arm' in the HSLCs, we have constructed the pronounced overall hockey-stick-shaped molecular conformation of these materials, and called the pseudo-rod-like (PRL) molecules with...

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Bibliographic Details
Published in:Liquid crystals 2019-11, Vol.46 (13-14), p.2042-2056
Main Authors: Choi, E-Joon, Kim, Hye-Jin, Kang, Seung-Chang, Kim, Dae-Yoon, Jeong, Kwang-Un, Lee, You-Jin, Yu, Chang-Jae, Kim, Jae-Hoon
Format: Article
Language:English
Subjects:
Boundary conditions
Calorimetry
Crossovers
Crystals
Hockey
hockey-stick liquid crystals
interdigitated bilayer structure
Light microscopy
Liquid crystals
mesophase polymorphism
Molecular conformation
Optical microscopy
Organic chemistry
Polar symmetry
Polarity
Polymorphism
uniform texture
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Summary:New hockey-stick-shaped liquid crystals (HSLCs) have been designed and synthesised. By extreme shortening of one 'arm' in the HSLCs, we have constructed the pronounced overall hockey-stick-shaped molecular conformation of these materials, and called the pseudo-rod-like (PRL) molecules with hockey-stick-shaped mesogen. The chemical structures were identified using spectroscopy and elemental analysis. The mesomorphic behaviour was investigated by polarising optical microscopy (POM), differential scanning calorimetry (DSC), X-ray diffractometry (XRD), and via electro-optical experiments. As a result, in spite of the PRL molecules, the various mesomorphic polymorphism, the interdigitated bi-layered structure and macroscopic polarity were found. Similar to up-to-date HSLCs, the quasi-bent-core LCs showed a transition from the synclinic SmC phase (SmC s ) to anticlinic SmC (SmC a ) phase, and exhibited SmA-type (N CybA ) and SmC-type (N CybC ) cybotactic nematic phases. At the same time, similar to practical rod-like LCs, the PRL molecules showed good surface alignment behaviour under planar boundary conditions.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678292.2019.1630492