Effect of lateral fluorine substitution far from the chiral center on mesomorphic behaviour of highly titled antiferroelectric (S) and (R) enantiomers

0494617 - FZÚ 2019 RIV NL eng J - Journal Article
Żurowska, M. - Dziaduszek, J. - Szala, M. - Morawiak, P. - Bubnov, Alexej
Effect of lateral fluorine substitution far from the chiral center on mesomorphic behaviour of highly titled antiferroelectric (S) and (R) enantiomers.
Journal of Molecular Liquids. Roč. 267, Oct (2018), s. 504-510. ISSN 0167-7322. E-ISSN 1873-3166
R&D Projects: GA ČR GA16-12150S
Institutional support: RVO:68378271
Keywords : antiferroelectric liquid crystal * ferroelectric liquid crystal * liquid crystal * orthoconic materials * smectic phase * tilt angle
OECD category: Materials engineering
Impact factor: 4.561, year: 2018

Several new liquid crystalline chiral ester enantiomers in the (S) and (R) configuration were designed and characterised. In order to tune their mesomorphic properties the molecular core was laterally substituted by fluorine atoms in different positions of the phenyl ring placed far from the chiral centre. All the materials possess the paraelectric orthogonal smectic A*, the ferroelectric tilted smectic C* and antiferroelectric tilted smectic C*A phases over a broad temperature range down to room temperature. Properties of the materials were characterised by the polarising optical microscopy, differential scanning calorimetry, electro-optics and dielectric spectroscopy. Due to high chemical stability, broad temperature range of polar smectic mesophases (up to 110 K) and very high values of the optical tilt angle (40-45o), these materials can be used as chiral dopants for the multicomponent orthoconic mixture design aimed for advanced electro-optic and photonic devices.
Permanent Link: http://hdl.handle.net/11104/0287729