Shoji Toda

Physical properties of new phenylpyrimidine type ferroelectric liquid crystals

Abstract New phenylpyrimidine type ferroelecaic liquid crystals were synthesized and their mesomorphic and physical properties were studied. These compounds have chiral carbon directly linked to core part or methylene unit between chiral carbon and core aromatic ring. The internal methylene unit stabilizes liquid crystal phases thermally without increasing rotational viscosity. Sign of spontaneous polarization, twist sense of cholesteric phase and smectic C* phase do not exhibit odd- even effet concerned with internal methylene chain length.

Physical properties of novel biphenyl and phenylpyrimidine type ferroelectric liquid crystals

Abstract A relationship between molecular structures and physical properties of novel biphenyl and phenylpyrimidine derivatives(1) is reported. These compounds have methylene chain directly linked to the core aromatic ring. The carbon number of alkyl chain has much influence on phase sequence, ferroelecmc properties and helical pitch in induced choles-teric phase. The phenylpyrimidine derivatives showed wider temperature range of Sc* phase compared with the biphenyl derivatives.

Syntheses and physical properties of new biphenyl and phenylpyrimidine type ferroelectric liquid crystals

Abstract New biphenyl and phenylpyrimidine type ferroelectric liquid crystals were synthesized and their physical properties studied. Each of these compounds has a chiral carbon atom directly linked to the core structure or has a methylene chain between the chiral carbon atom and the core moiety. The internal methylene chain and the core structure have an effect on the temperature range of the phase transition and the rotational viscosity in the Sc* phase, respectively.