Diarylethane α-chloroester ferroelectric liquid crystals

Abstract
Four new chiral diarylethane α-chloroester series have been synthesized and studied. All of the derivatives are mesogenic and display a ferroelectric S∗c phase. In addition to this S∗c phase, some of them exhibit other ferroelectric S∗1 and/or S∗F phases. Transition temperatures and enthalpies are reported. Several electrooptical properties such as the spontaneous polarization and response times are given and discussed. Layer thickness and tilt angle in the smectic S∗c phases of series II compounds were determined by X-ray diffraction.