Does Introduction of a Bent Tail Stabilize Biaxiality and Lateral Switching Behavior of Smectic A Liquid Crystal Phases of Rodlike Molecules?
Does Introduction of a Bent Tail Stabilize Biaxiality and Lateral Switching Behavior of Smectic A Liquid Crystal Phases of Rodlike Molecules?
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DOI：
10.1021/acs.jpcb.9b00589
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发表时间：
2019-04
期刊：
影响因子：
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通讯作者：
Chiharu Koga;Michinari Kohri;T. Taniguchi;K. Kishikawa
中科院分区：
文献类型：
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作者：
Chiharu Koga;Michinari Kohri;T. Taniguchi;K. Kishikawa
通过在直棒状分子末端引入油烯基，研究了尾部形状对近晶A相的液晶性、双轴性和侧向转换行为的影响。合成了三种含氟苯基（五氟苯基、2，3，4-三氟苯基和2，3-二氟苯基）和顺式十八碳烯基的分子，并与相应的含直链烷基（反式十八碳烯基或正十八烷基）的分子进行了液相堆积性能的比较.在开关实验中，具有弯曲末端链的分子比具有直末端链的分子表现出更高的自发极化（Ps）值。此外，具有弯曲末端链的分子的长轴的方向变化被抑制。这些结果表明，引入一个弯曲的终端链是非常有效的稳定铁电开关行为。
By introducing an oleyl group at the end of the straight rodlike molecule, the effect of the tail shape on the liquid crystallinity, biaxiality, and lateral switching behavior of the smectic A phase was investigated. Three types of molecules possessing a fluorinated phenyl (pentafluorophenyl, 2,3,4-trifluorophenyl, or 2,3-difluorophenyl) group and a cis-octadec-9-enyl group were synthesized, and their liquid crystallinities were compared with the corresponding molecules with a straight alkyl ( trans-octadec-9-enyl or n-octadecanyl) group. In switching experiments, the molecules with a bent terminal chain showed higher spontaneous polarization ( Ps) values than those with a straight terminal chain. Further, the directional changes of the long molecular axes were suppressed for the molecules possessing a bent terminal chain. These results show that the introduction of a bent terminal chain is highly effective for stabilizing ferroelectric switching behaviors.