First Order Paraelectric-Antiferroelectric Phase Transition in a Chiral Smectic Liquid Crystal of a Fluorine Containing Phenyl Pyrimidine Derivative

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Abstract
The first-order phase transition between paraelectric SmA and antiferroelectric SmCA * phases has been observed for the first time in (S)-4-(1-trifluoromethylheptyloxycarbonyl)phenyl 4-(5-dodecyloxypyrimidin-2-yl)benzoate (TFMHPDOPB). Three pieces of evidence for the first-order phase transition are shown by means of DSC, X-ray and dielectric measurements. The DSC peak of the SmA-SmCA * transition is as large as the one for the Iso-SmA transition. The temperature dependences of the interlayer spacing determined by X-ray diffraction and of the dielectric constant reveal marked discontinuous jumps at the SmA-SmCA * phase transition.