The Role of Substitution in the Apex Position of the Bent-Core on Mesomorphic Properties of New Series of Liquid Crystalline Materials

We present the synthesis and mesomorphic properties of the new series of bent-core liquid crystals based on 3-hydroxybenzoic acid bearing a lateral substituent in the apex position. Four different substituents of various sizes and electronic properties have been used. We have found that only compoun...

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Main Authors:	Helena Skopalová, Petr Špaček, Václav Kozmík, Jiří Svoboda, Vladimíra Novotná, Damian Pociecha, Michal Kohout
Format:	Article
Language:	English
Published:	MDPI AG 2020-08-01
Series:	Crystals
Subjects:	liquid crystals bent-core columnar phase switchable lamellar phase dielectric spectroscopy
Online Access:	https://www.mdpi.com/2073-4352/10/9/735

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spelling	doaj-838d2f5a2aa04f4cbeac015947c9b4912020-11-25T02:58:46ZengMDPI AGCrystals2073-43522020-08-011073573510.3390/cryst10090735The Role of Substitution in the Apex Position of the Bent-Core on Mesomorphic Properties of New Series of Liquid Crystalline MaterialsHelena Skopalová0Petr Špaček1Václav Kozmík2Jiří Svoboda3Vladimíra Novotná4Damian Pociecha5Michal Kohout6Department of Organic Chemistry, University of Chemistry and Technology, CZ-166 28 Prague 6, Czech RepublicDepartment of Organic Chemistry, University of Chemistry and Technology, CZ-166 28 Prague 6, Czech RepublicDepartment of Organic Chemistry, University of Chemistry and Technology, CZ-166 28 Prague 6, Czech RepublicDepartment of Organic Chemistry, University of Chemistry and Technology, CZ-166 28 Prague 6, Czech RepublicInstitute of Physics of the Czech Academy of Sciences, Na Slovance 2, CZ-182 21 Prague 9, Czech RepublicLaboratory of Dielectrics and Magnetics, Chemistry Department, Warsaw University, Al. Zwirki i Wigury 101, 02-089 Warsaw, PolandDepartment of Organic Chemistry, University of Chemistry and Technology, CZ-166 28 Prague 6, Czech RepublicWe present the synthesis and mesomorphic properties of the new series of bent-core liquid crystals based on 3-hydroxybenzoic acid bearing a lateral substituent in the apex position. Four different substituents of various sizes and electronic properties have been used. We have found that only compounds substituted with fluorine are mesogenic and exhibit one mesophase, whose type differs when prolonging the terminal alkyl chain. For homologues with shorter alkyl chains (octyl, decyl), a columnar B<sub>1</sub>-type of a mesophase was observed, while materials with longer terminal chains (dodecyl, tetradecyl) exhibited a switchable lamellar SmC<sub>A</sub>P<sub>A</sub> phase. Calorimetric measurements, texture observations under a polarizing microscope were performed and electro-optical properties studied. Additionally, dielectric measurements were realized to characterize the molecular dynamics in the SmC<sub>A</sub>P<sub>A</sub> phase. All mesogenic compounds were further studied by X-ray measurements to confirm phase identification and obtain more information about their structural parameters.https://www.mdpi.com/2073-4352/10/9/735liquid crystalsbent-corecolumnar phaseswitchable lamellar phasedielectric spectroscopy
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Helena Skopalová Petr Špaček Václav Kozmík Jiří Svoboda Vladimíra Novotná Damian Pociecha Michal Kohout
spellingShingle	Helena Skopalová Petr Špaček Václav Kozmík Jiří Svoboda Vladimíra Novotná Damian Pociecha Michal Kohout The Role of Substitution in the Apex Position of the Bent-Core on Mesomorphic Properties of New Series of Liquid Crystalline Materials Crystals liquid crystals bent-core columnar phase switchable lamellar phase dielectric spectroscopy
author_facet	Helena Skopalová Petr Špaček Václav Kozmík Jiří Svoboda Vladimíra Novotná Damian Pociecha Michal Kohout
author_sort	Helena Skopalová
title	The Role of Substitution in the Apex Position of the Bent-Core on Mesomorphic Properties of New Series of Liquid Crystalline Materials
title_short	The Role of Substitution in the Apex Position of the Bent-Core on Mesomorphic Properties of New Series of Liquid Crystalline Materials
title_full	The Role of Substitution in the Apex Position of the Bent-Core on Mesomorphic Properties of New Series of Liquid Crystalline Materials
title_fullStr	The Role of Substitution in the Apex Position of the Bent-Core on Mesomorphic Properties of New Series of Liquid Crystalline Materials
title_full_unstemmed	The Role of Substitution in the Apex Position of the Bent-Core on Mesomorphic Properties of New Series of Liquid Crystalline Materials
title_sort	role of substitution in the apex position of the bent-core on mesomorphic properties of new series of liquid crystalline materials
publisher	MDPI AG
series	Crystals
issn	2073-4352
publishDate	2020-08-01
description	We present the synthesis and mesomorphic properties of the new series of bent-core liquid crystals based on 3-hydroxybenzoic acid bearing a lateral substituent in the apex position. Four different substituents of various sizes and electronic properties have been used. We have found that only compounds substituted with fluorine are mesogenic and exhibit one mesophase, whose type differs when prolonging the terminal alkyl chain. For homologues with shorter alkyl chains (octyl, decyl), a columnar B<sub>1</sub>-type of a mesophase was observed, while materials with longer terminal chains (dodecyl, tetradecyl) exhibited a switchable lamellar SmC<sub>A</sub>P<sub>A</sub> phase. Calorimetric measurements, texture observations under a polarizing microscope were performed and electro-optical properties studied. Additionally, dielectric measurements were realized to characterize the molecular dynamics in the SmC<sub>A</sub>P<sub>A</sub> phase. All mesogenic compounds were further studied by X-ray measurements to confirm phase identification and obtain more information about their structural parameters.
topic	liquid crystals bent-core columnar phase switchable lamellar phase dielectric spectroscopy
url	https://www.mdpi.com/2073-4352/10/9/735
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The Role of Substitution in the Apex Position of the Bent-Core on Mesomorphic Properties of New Series of Liquid Crystalline Materials

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