Thermal properties of pentaerythritol derivatives with chiral moiety

Pentaerythritol derivatives containing four mesogenic groups with chiral mo ieties were synthesized. Cholesterol and 2-methyl-1-butanol were used as a chiral moiety. All compounds which derivate from pentaerythritol and mesoge nic group showed a glass transition temperature above room temperature, Cry stallization from melt of these compounds was strongly suppressed. The comp ound that the mesogenic group has one benzene ring linked by ester bonding between mesogenic and cholesteryl group exhibited the smectic A(1) phase. W hile the compounds that the mesogenic group has two benzene rings linked by ester bonding with cholesteryl group exhibited the cholesteric phase. The compounds that the mesogenic group has three benzene rings linked by one es ter bonding with 2-methlbutyl group also exhibited the smectic A(2) phase a nd the cholesteric phase.