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首页> 外文期刊>RSC Advances >Design, synthesis and mesomorphic behaviour of a four-ring achiral bent-core liquid crystal in the nematic phase
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Design, synthesis and mesomorphic behaviour of a four-ring achiral bent-core liquid crystal in the nematic phase

机译：四环成型弯曲芯晶体在向列相中的设计，合成和中的态度行为

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Bent-core nematics have attracted growing interest because of the unconventional properties and extraordinary effects exhibited by these liquid crystalline phases. In this report we design, synthesize and characterize four different four-ring achiral bent-core liquid crystals containing a methyl group in the central phenyl ring. The mesomorphic behaviour of compounds has been investigated by optical polarizing microscopy, differential scanning calorimetry, electro-optical investigation, and dielectric spectroscopy. Calculations based on density functional theory of the molecules were also carried out. The addition of a methyl group in the central phenyl ring not only induces the lowering of the clearing point but also enhances the nematic phase range. Dielectric spectroscopy reveals a low frequency relaxation peak and a very large dielectric permittivity; which is the characteristic of cybotactic clusters. In electro-optic studies, spontaneous polarization peaks are not observed. However, a periodic pattern is observed under the application of an ac electric field. Finally, the compounds show a weak tendency to crystallize; which makes it possible to supercool the cybotactic nematic phase down to room temperature.
机译：由于这些液晶相表现出的非常规性和非凡的效果，弯曲核心线性引起了生长的兴趣。在本报告中，我们设计，合成和表征四种不同的四环成型弯曲核液晶，其含有中央苯环中的甲基。通过光学偏振显微镜，差示扫描量热法，电光研究和介电光谱研究了化合物的中间形行为。还进行了基于密度函数理论的分子的计算。在中央苯环中加入甲基不仅诱导清除点的降低，而且还增强了向列的相位范围。介电光谱显示出低频松弛峰值和非常大的介电介电常数;这是Cybotactic集群的特征。在电光研究中，未观察到自发极化峰。然而，在AC电场的应用下观察到周期性图案。最后，化合物显示出弱的结晶趋势;这使得可以将Cybotactic向型阶段过脱落至室温。

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