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Alaasar M, Prehm M, Tamba MG, et al. Development of Polar Order in the Liquid Crystal Phases of a 4-Cyanoresorcinol-Based Bent-Core Mesogen with Fluorinated Azobenzene Wings. Chemphyschem. 2015;17(2):278-87doi: 10.1002/cphc.201500891.
Alaasar, M., Prehm, M., Tamba, M. G., Sebastián, N., Eremin, A., & Tschierske, C. (2016). Development of Polar Order in the Liquid Crystal Phases of a 4-Cyanoresorcinol-Based Bent-Core Mesogen with Fluorinated Azobenzene Wings. Chemphyschem : a European journal of chemical physics and physical chemistry, 17(2), 278-87. https://doi.org/10.1002/cphc.201500891
Alaasar, Mohamed, et al. "Development of Polar Order in the Liquid Crystal Phases of a 4-Cyanoresorcinol-Based Bent-Core Mesogen with Fluorinated Azobenzene Wings." Chemphyschem : a European journal of chemical physics and physical chemistry vol. 17,2 (2016): 278-87. doi: https://doi.org/10.1002/cphc.201500891
Alaasar M, Prehm M, Tamba MG, Sebastián N, Eremin A, Tschierske C. Development of Polar Order in the Liquid Crystal Phases of a 4-Cyanoresorcinol-Based Bent-Core Mesogen with Fluorinated Azobenzene Wings. Chemphyschem. 2016 Jan 18;17(2):278-87. doi: 10.1002/cphc.201500891. Epub 2015 Dec 04. PMID: 26581648.
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Chemphyschem. 2016 Jan 18;17(2):278-87. doi: 10.1002/cphc.201500891. Epub 2015 Dec 04.

Development of Polar Order in the Liquid Crystal Phases of a 4-Cyanoresorcinol-Based Bent-Core Mesogen with Fluorinated Azobenzene Wings.

Chemphyschem : a European journal of chemical physics and physical chemistry

Mohamed Alaasar, Marko Prehm, Maria-Gabriela Tamba, Nerea Sebastián, Alexey Eremin, Carsten Tschierske

Affiliations

  1. Institute of Chemistry, Organic Chemistry, Martin Luther University Halle-Wittenberg, Kurt-Mothes Str. 2, 06120, Halle/Saale, Germany. [email protected].
  2. Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt. [email protected].
  3. Institute of Chemistry, Organic Chemistry, Martin Luther University Halle-Wittenberg, Kurt-Mothes Str. 2, 06120, Halle/Saale, Germany.
  4. Institute for Experimental Physics, Otto-von-Guericke University Magdeburg, Universitätsplatz 2, 39106, Magdeburg, Germany.
  5. Institute for Experimental Physics, Otto-von-Guericke University Magdeburg, Universitätsplatz 2, 39106, Magdeburg, Germany. [email protected].
  6. Institute of Chemistry, Organic Chemistry, Martin Luther University Halle-Wittenberg, Kurt-Mothes Str. 2, 06120, Halle/Saale, Germany. [email protected].

PMID: 26581648 DOI: 10.1002/cphc.201500891

Abstract

A bent-core mesogen consisting of a 4-cyanoresorcinol unit as the central core and laterally fluorinated azobenzene wings forms four different smectic LC phase structures in the sequence SmA-SmCs -SmCs PAR -M, all involving polar SmCs PS domains with growing coherence length of tilt and polar order on decreasing temperature. The SmA phase is a cluster-type de Vries phase with randomized tilt and polar direction; in the paraelectric SmCs phase the tilt becomes uniform, although polar order is still short-range. Increasing polar correlation leads to a new tilted and randomized polar smectic phase with antipolar correlation between the domains (SmCs PAR ) which then transforms into a viscous polar mesophase M. As another interesting feature, spontaneous symmetry breaking by formation of a conglomerate of chiral domains is observed in the non-polar paraelectric SmCs phase.

© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Keywords: azobenzene; bent-core liquid crystals; de Vries phase; ferroelectricity; mirror symmetry breaking

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