Synthesis and mesomorphic properties of laterally fluorinated alkyl 4′′-alkylterphenyl-4-yl carbonate liquid crystals
作者:Artur Chołuj、Przemysław Kula、Roman Dąbrowski、Marzena Tykarska、Leszek Jaroszewicz
DOI:10.1039/c3tc31461h
日期:——
Fifteen series of homologues of a variety of mono-, di- and trifluorosubstituted alkyl 4â²â²-alkylterphenyl-4-yl carbonates have been synthesized and their mesomorphic properties have been determined. From among 95 prepared compounds, 40 pure nematogens have been found, as well as 55 mesogens with orthogonal and tilted smectic phases in broad temperature ranges. The type and combination of the LC phase strongly depend on the position and number of the fluorine atoms. Physical properties and correlations between the molecular core fluorosubstitution, the length of the terminal chains and the type and sequence of the liquid crystalline phases, have been determined. The compounds are useful for the formulation of nematic mixtures as well as ferroelectric ones.
十五个系列的同系物,包括单、二和三氟取代的烷基4″-烷基三联苯-4-基碳酸盐,已被合成并测定了它们的液晶性质。在制备的95种化合物中,发现了40种纯向列相生成物,以及55种在宽温度范围内具有正交相和倾斜层状相的液晶物质。液晶相的类型和组合强烈依赖于氟原子的位置和数量。确定了物理性质以及分子核氟取代、末端链长度与液晶相类型和顺序之间的相关性。这些化合物对配制向列相混合物以及铁电混合物都很有用。