Synthesis and Liquid Crystal Properties of Chiral Compounds Containing the Core Structure of 6‐Hydroxynicotinic Acid or 4‐Hydroxyphenylacetic Acid

Abstract

The carboxylic acid 4‐hydroxybenzoic acid, bonded directly with (R)‐2‐octanol, is the core molecule of chiral liquid crystal (R)‐MHPOBC. This acid was substituted either by 6‐hydroxynicotinic or by 4‐hydroxyphenylacetic acid. Such a structural variation induced a remarkable influence on the liquid crystal properties of (R)‐MHPOBC. The series of compounds 1˜4 containing 6‐hydroxynicotinic acid moiety tend to exhibit a chiral smectic C (SmC*) phase, while the series of compounds 5˜8 containing 4‐hydroxyphenylacetic acid moiety tend to possess a chiral nematic (N*) phase.

Spontaneous polarization and dielectric relaxation dynamics of ferroelectric liquid crystals derived from 2(S)-[2(S)-ethylhexyolxy] propionic acid and its (S, R)-diastereomer

“…The unique feature of spontaneous polarization (Ps) in FLCs is an important factor for electro-optical applications since liquid crystals with significant polarization are expected to display faster reorientation in an optical light shutter [1]. The physical properties of the ferroelectric phase are dramatically affected by the structure of the FLC compounds [4][5][6]. For example, Dabrowski et al observed that substituting a naphthyl group for the biphenyl group in the FLC compounds reduces the clearing temperature, mesophase transition temperatures, and the phase range of the liquid crystal region.…”

“…1 shows the molecular structures of the four FLC samples used for this study. For the details on the FLC synthesis, please refer to related literature [24][25][26]. The structural difference between the four FLC compounds is mainly in the core and the diastereomeric molecules.…”

Spontaneous Polarization and Dielectric Relaxation Dynamics of Two Novel Diastereomeric Ferroelectric Liquid Crystals

“…1, the molecular structures of the two FLC samples used for this study are depicted. Please refer to reports [21][22][23] for the details on FLC synthesis. The structural difference between the two FLC compounds was in the diastereomeric molecules.…”

“…Of the entire class of liquid crystals, ferroelectric liquid crystals (FLCs) have attracted interest not only in fundamental research but also for their technological application [1][2][3][4]. The spontaneous polarization (Ps), which is dramatically affected by the structure of the FLC compounds [4][5][6], is an important factor in their technological applications.…”