Laterally substituted biphenyl benzoates - synthesis and mesomorphic properties

0541639 - FZÚ 2022 RIV GB eng J - Journal Article
Cigl, Martin - Hampl, F. - Svoboda, J. - Podoliak, Natalia - Stulov, Sergey - Kohout, M. - Novotná, Vladimíra
Laterally substituted biphenyl benzoates - synthesis and mesomorphic properties.
Liquid Crystals. Roč. 48, č. 4 (2021), s. 526-536. ISSN 0267-8292. E-ISSN 1366-5855
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR GA18-14497S
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : biphenyl benzoates * lateral substitution * nematics * smectic phases
OECD category: Organic chemistry
Impact factor: 2.676, year: 2021
Method of publishing: Limited access
https://doi.org/10.1080/02678292.2020.1794069

We have synthesised several series of dialkoxy-terminated biphenyl benzoates with lateral substituents (F, Cl) in the vicinity of the ester linking group, varying the length of the terminal alkyl chains. The aim was to study mesomorphic properties of these new compounds and compare them with the previously reported analogous phenyl biphenylcarboxylates, which possess reverse orientation of the ester linking group. The studied compounds were characterised by differential scanning calorimetry, polarising optical microscopy and birefringence measurements. For selected homologues, the type of mesophases was confirmed by x-ray scattering analysis. We calculated the dipole moments and suggested its correlation with the preference of tilted smectic phases in studied biphenyl benzoates. Generally, lateral substitution causes the drop of phase transition temperatures as well as melting points, giving rise to mesophases in a wide temperature range, in several cases down to the room temperature.
Permanent Link: http://hdl.handle.net/11104/0319171