Bent-core liquid crystals based on 6-substituted 3-hydroxybenzoic acid: the role of substitution and linkage group orientation on mesomorphic properties

0471345 - FZÚ 2017 RIV GB eng J - Journal Article
Tůma, J. - Kohout, M. - Svoboda, J. - Novotná, Vladimíra - Pociecha, D.
Bent-core liquid crystals based on 6-substituted 3-hydroxybenzoic acid: the role of substitution and linkage group orientation on mesomorphic properties.
Liquid Crystals. Roč. 43, č. 12 (2016), s. 1889-1900. ISSN 0267-8292. E-ISSN 1366-5855
R&D Projects: GA ČR GA15-02843S
Institutional support: RVO:68378271
Keywords : liquid crystals
Subject RIV: JJ - Other Materials
Impact factor: 2.661, year: 2016

We have prepared and studied new series of bent-core liquid crystals based on laterally substituted 3-hydroxybenzoic acid. The physical properties of the materials were tuned by the type of lateral substitution in the vicinity of the carboxylic unit. Further modification was achieved by reorientation of connecting ester linkages in the elongating side arms and by changing the length of terminal alkyl chains. The physical properties of the materials were determined by differential scanning calorimetry (DSC), polarising optical microscopy and for selected compounds by x-ray diffraction analysis. The introduction of fluorine as lateral substituent leads to the appearance of a lamellar or columnar mesophase. On contrary, methyl- or chlorine-substituted compounds are mostly crystalline. We have found a strong correlation between the size of the lateral substituent and the mesogenicity of the studied materials.
Permanent Link: http://hdl.handle.net/11104/0268731