Ferroelectric liquid Crystallinity of Unsymmetrically Disubstituted Pyrazines with Chiral Substituents

Ferroelectric liquid crystallinity of unsymmetrically substituted arylpyrazines and diarylpyrazines with chiral substituents were investigated. The arylpyrazines with (S)-4-methylhexyloxyl group in the pyrazine ring showed chiral smectic C phase (Sc* phase) at the low temperature. The diarylpyrazines were revealed to f orm thermally stable Sc* phase over wider ranges of temperatures. Several compounds were revealed to have excellent ferroelectric liquid crystlline properties. Particularly, thermal stability of Sc* phase for compounds having long chain alkoxyl groups and (S)-2-methylbutoxycarbonyl group was increased. The properties of ferroelectric liquid crystalline phases for a ser ies of the compounds were measured. The tilt angle were about 22.5° and the spontaneous polarization was largest at the dodecyloxy group and the response touelectric field was faster than the other compounds. t Synthesisa nd FerroelectricL iquid Crystal of UnsymmetricallyD isubstituted Pyrazine sw ith Chiral Substituents