Abstract
A series of semi-perfluorinated ferroelectric liquid crystals, 2-[4-(2-fluoro-octyloxy)phenyl]- 5-(omega-n-perfluoroalkylalkyloxy)pyrimidines were prepared and their physical properties evaluated. All of the fluorinated phenylpyrimidines exhibited a chiral smectic C phase enantiotropically. The results showed that high fluorination extent favours the tilted chiral smectic C phase. Also, highly fluorinated compounds exhibited a large cone tilt angle and large spontaneous polarization. However, the response became slow as the fluorination extent increased. Although the compounds showed a large spontaneous polarization in the pure state, their spontaneous polarization power as chiral dopants was so small that very little spontaneous polarization could be measured.
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