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Issue 6, 2018
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The design of smectic liquid crystals with an axially chiral biphenyl core: in search of a proper ferroelectric liquid crystal phase

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Abstract

We report the results of a study in which we introduce a tricarbosilane end-group in a mesogenic scaffold derived from an axially chiral biphenyl with a large transverse dipole moment. This structural modification is intended to promote the formation of a chiral smectic C (SmC*) phase, with the aim of discovering a mesogen with a virtual transition temperature to a proper ferroelectric phase (To) that approaches the crystal-SmC* melting point. We show herein that the combination of a 4-pentylbicyclo[2.2.2]octane-1-carboxylate chain and a tricarbosilane-terminated 4-alkoxybenzoate chain gives a mesogen (R,S)-WL43 forming an enantiotropic orthogonal smectic A (SmA) phase and a higher order tilted smectic phase. Substitution of the 4-pentylbicyclo[2.2.2]octane-1-carboxylate group with a trans-4-pentylcyclohexane-1-carboxylate group gives a mesogen (R,S)-WL45 forming monotropic SmA and SmC phases. The SmC* phase formed by the enantiomerically pure (R)-WL45 exhibits Goldstone-mode switching characteristic of a surface-stabilized FLC, but its spontaneous polarization PS is too low to be measured by conventional methods.

Graphical abstract: The design of smectic liquid crystals with an axially chiral biphenyl core: in search of a proper ferroelectric liquid crystal phase

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Supplementary files

Article information


Submitted
27 Nov 2017
Accepted
22 Jan 2018
First published
23 Jan 2018

J. Mater. Chem. C, 2018,6, 1562-1566
Article type
Paper

The design of smectic liquid crystals with an axially chiral biphenyl core: in search of a proper ferroelectric liquid crystal phase

Z. Ahmed, C. Müller, M. Holzwarth, C. Haege, F. Giesselmann and R. P. Lemieux, J. Mater. Chem. C, 2018, 6, 1562
DOI: 10.1039/C7TC05426B

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