Synthesis and properties of fluorine tail-terminated cyanobiphenyls and terphenyls for chemoresponsive liquid crystals
Synthesis and properties of fluorine tail-terminated cyanobiphenyls and terphenyls for chemoresponsive liquid crystals
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DOI：
10.1080/02678292.2019.1616228
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发表时间：
2020-01
期刊：
影响因子：
2.2
通讯作者：
Kunlun Wang;Prabin Rai;Ashani Fernando;Tibor Szilvási;Huaizhe Yu;N. Abbott;M. Mavrikakis;R. Twieg
中科院分区：
文献类型：
--
作者：
Kunlun Wang;Prabin Rai;Ashani Fernando;Tibor Szilvási;Huaizhe Yu;N. Abbott;M. Mavrikakis;R. Twieg
摘要合成了一系列含氟尾烷氧基和烷基氰基联苯化合物以及一些氰基对三联苯衍生物，并对其介晶性质进行了研究。与非氟化的K系列和M系列的比较表明，末端氟原子通常降低转变温度，更有趣的是，抑制近晶相的形成。发现由氟尾封端的化合物形成的几种二元LC混合物表现出具有宽范围的有前途的室温下的液晶相。混合物F7OCB和F8OCB显示在金属盐修饰的表面和自由表面的平面有序的垂面有序，这可能在设计对目标分析物更灵敏和更快的LC系统中具有潜在的应用。图形摘要
ABSTRACT A series of fluorine tail-terminated alkoxy and alkyl cyanobiphenyl compounds and some cyano-p-terphenyl derivatives were synthesised and mesogenic properties described. Comparison with the non-fluorinated K series and M series indicates that the terminal fluorine atom generally decreases the transition temperatures and, more interestingly, depresses the formation of a smectic phase. Several binary LC mixtures formed by the fluorine tail-terminated compounds were found exhibiting promising room temperature nematic phases with wide ranges. The mixture F7OCB and F8OCB shows homeotropic ordering at the metal salts-decorated surfaces and planar ordering at the free surface, which may have potential application in designing a more sensitive and faster LC system to targeted analytes. Graphical abstract