Two new series of ferroelectric liquid crystals with a fluorinated asymmetric frame were synthesized by utilizing optically active S-(-)-2-fluoroalkanols or S-(-)-2-fluoroalkanoic acids, and their mesomorphic and physical properties were studied. 5-Alkyl-2-[p-(2-fluoroalkyloxy)phenyl]pyrimidines (5, n ≧ 6, m = 12) exhibited enantiotropic chiral smectic C phase, and their spontaneous polarizations were more than 34nC/cm2 (except for n = 4). The values of response time were short (on the order of 10 μ sec) and were found to be shorter by decreasing the value of n. 5-Alkyl-2-[p-(2-fluoroalkanoyloxy)phenyl]pyrimidines (6) exhibited the monotropic chiral smectic C phase characterized by an extremely short response time of 4.2 μ sec.
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Nakamura et al. (1990) studied this question.
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