Mesomorphic properties of non-symmetric bent-core liquid crystals with a lateral substituent in the apex position

0542865 - FZÚ 2022 RIV GB eng J - Journal Article
Skopalová, H. - Kozmik, V. - Šmahel, M. - Svoboda, J. - Pacherová, Oliva - Kohout, M. - Novotná, Vladimíra
Mesomorphic properties of non-symmetric bent-core liquid crystals with a lateral substituent in the apex position.
Liquid Crystals. Roč. 48, č. 7 (2021), s. 1010-1024. ISSN 0267-8292. E-ISSN 1366-5855
R&D Projects: GA ČR GA18-14497S; GA MŠMT(CZ) EF16_019/0000760
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : liquid crystals * bent-core liquid crystals * apex substitution * terephthalate unit * polar smectic phase * SmC phase
OECD category: Materials engineering
Impact factor: 2.676, year: 2021
Method of publishing: Limited access
https://doi.org/10.1080/02678292.2020.1836567

We present a new series of bent-core liquid crystals possessing a lateral substituent in the apex position of the central core and a terephthalate connecting unit in one elongating side arm. The synthesised materials have been studied by polarizing optical microscopy, differential scanning calorimetry, dielectric spectroscopy and X-ray diffraction. Electro-optical studies have also been performed in order to confirm the character of the identified polar smectic phase. We document that materials substituted with fluorine exhibit polar synclininic antiferroelectric phase, for homologues with longer terminal alkyl chains, this SmCP phase is accompanied with a high temperature SmC phase. Our results document that the introduction of the aforementioned structural features triggers significant modification of the mesomorphic behaviour observed for similar compounds.

Permanent Link: http://hdl.handle.net/11104/0320203