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New ferroelectric liquid crystals with a trifluoromethyl group
Authors:Goroh Saitoh  Toyokazu Nakamura  Masayoshi Suzuki  Masahiro Satoh  Kunikio Yoshio  Tetsuya Watanabe
Institution:  a Functional Devices Research Laboratories, NEC Corporation, Kawasaki, Kanagawa, Japan b Near Future Research Dept., Sanyo Chemical Industries, Ltd., Kyoto, P.C., Japan
Abstract:New chiral dopants, possessing a trifluoromethyl group, have been synthesized. These dopants have different polar groups, located between the chiral centre and the diphenylacetylene core. The polar part is chosen from ester, methylene ether and ether linkages. Each new chiral dopant was mixed with a non-chiral liquid crystal mixture or a ferroelectric liquid crystal mixture, and their transition temperatures and electrooptic properties measured. The largest spontaneous polarization, 4·1 nC cm-2, was obtained at 25°C for the ferroelectric liquid crystal mixture in which the dopant, with a methylene ether linkage, was incorporated. Molecular orbital calculations (MNDO method) for the dopants show that the calculated dipole moments are correlated with the measured spontaneous polarization, and the calculated results explain the experimental results quite well. In addition, it has been found that the conformation of the chiral part is an important factor which affects the magnitude of spontaneous polarization.
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