Investigation of the tilt angle and spontaneous polarisation of antiferroelectric liquid crystals with a chiral centre based on (S)-(+)-3-octanol

The electro-optical properties (tilt angle of the director and spontaneous polarisation) of eight smectic liquid crystalline compounds with a chiral centre based on (S)-(+)-3-octanol and different substitution of the benzene ring and different length of the oligomethylene spacer (-(CH2)(n)O-) were studied. The compounds possess the self-assembling behaviour with an antiferroelectric ordering in smectic C-a* phase at a broad temperature range, some of materials have also a ferroelectric smectic C* phase and/or an orthogonal smectic A* phase. Due to high chemical stability and very high values of the optical tilt angle (40-44 degrees) at saturation, the tested compounds can be used as chiral components for orthoconic antiferroelectric liquid crystalline mixtures. (C) 2021 Elsevier B.V. All rights reserved.