Abstract
The thermal properties of a homologous series of 4-alkoxy-phenyl 4-(4-trifluoromethylbenzoyloxy)benzoates were examined. The homologues show remarkable smectic properties involving a smectic A and a higher order smectic phase characterized by microscopic and X-ray experiments, indicating that the molecules have a partially bilayer arrangement in both smectic phases. Based on these results, molecular arrangements of the two smectic phases are proposed. The effects of the trifluoromethyl group on the thermal properties of the smectic and crystalline phases are discussed in terms of the fluorophilic interaction around the boundary of the smectic layer.
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