Issue 8, 2003
From the journal:

Journal of Materials Chemistry

Different nematic phases and a switchable SmCP phase formed by homologues of a new class of asymmetric bent-core mesogens

Martin W. Schröder,a   Siegmar Diele,*a   Gerhard Pelzl,a   Ulrike Dunemann,a   Horst Kressea  and  Wolfgang Weissfloga  

* Corresponding authors

a Institut für Physikalische Chemie, Martin-Luther-Universität Halle-Wittenberg, Mühlpforte 1, D-06108 Halle(Saale), Germany
E-mail: diele@chemie.uni-halle.de

Abstract

Ten homologues of a new class of asymmetric bent-shaped compounds have been synthesized. Their mesophase behaviour was investigated by polarizing microscopy, X-ray diffraction, dielectric and electro-optical measurements. The long-chain members of the series C8–C16 exhibit the switchable antiferroelectric SmCP phase. The short-chain members C4–C8 form a nematic phase. The homologues C5 and C6 show a transition from the nematic into a low-temperature phase which is indicated by a sharp peak in the DSC trace. Whereas the textures point to a nematic–smectic transition, the X-ray studies definitely prove a structure without any long range (or quasi long range) positional order in the low-temperature phase. A molecular model is described which exhibits structural features similar to those of a NCol phase, which can be regarded as the precursor of the following columnar phase (B1 phase).

Graphical abstract: Different nematic phases and a switchable SmCP phase formed by homologues of a new class of asymmetric bent-core mesogens

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Article information

DOI
https://doi.org/10.1039/B305451A
Article type
Paper
Submitted
15 May 2003
Accepted
02 Jun 2003
First published
20 Jun 2003

J. Mater. Chem., 2003,13, 1877-1882

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Different nematic phases and a switchable SmCP phase formed by homologues of a new class of asymmetric bent-core mesogens

M. W. Schröder, S. Diele, G. Pelzl, U. Dunemann, H. Kresse and W. Weissflog, J. Mater. Chem., 2003, 13, 1877 DOI: 10.1039/B305451A

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