Ferroelectric and antiferroelectric “banana phases” of new fluorinated five-ring bent-core mesogens

Hajnalka Nádasi; Wolfgang Weissflog; Alexey Eremin; Gerhard Pelzl; Siegmar Diele; B. Das; Siegbert Grande

doi:10.1039/B111421B

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Hajnalka Nádasi,^a Wolfgang Weissflog,^a Alexey Eremin,^a Gerhard Pelzl,*^a Siegmar Diele,^a B. Das^b and Siegbert Grande^b

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* Corresponding authors

^a Institut für Physikalische Chemie, Martin-Luther-Universität Halle-Wittenberg, Mühlpforte 1, Halle/S., Germany

^b Universität Leipzig, Fakultät für Physik und Geowissenschaften, Linnéstraße 5, Leipzig, Germany

Abstract

Two homologous achiral five-ring mesogens with lateral fluorine substituents on the core and on the outer rings are presented. Both compounds exhibit two B₅ phases and the B₂ phase. The high-temperature B₅ phases possess an antiferroelectric ground state. The low-temperature B₅ phase was found to be ferroelectric, which is indicated by the bistable switching. The assignment and characterization of the mesophases is based on XRD measurements, ¹H-, ¹⁹F-, ¹³C-NMR and electro-optical measurements.

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Article information

DOI: https://doi.org/10.1039/B111421B
Article type: Paper
Submitted: 17 Dec 2001
Accepted: 13 Feb 2002
First published: 21 Mar 2002

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J. Mater. Chem., 2002,12, 1316-1324

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