Photosensitive bent-core nematic liquid crystals with various linking units in the side arms: Structure-properties relationships
Photosensitive bent-core nematic liquid crystals with various linking units in the side arms: Structure-properties relationships
复制标题
侧臂中具有各种连接单元的光敏弯核向列液晶：结构-性能关系
DOI：
10.1016/j.molliq.2020.112743
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发表时间：
2020-05
影响因子：
6
通讯作者：
Kohout Michal
中科院分区：
文献类型：
--
作者：
Smahel Michal;Poryvai Anna;Xiang Ying;Pociecha Damian;Troha Tinkara;Novotna Vladimira;Svoboda Jiri;Kohout Michal
我们提出了两个异构体系列的光敏弯核液晶，在中间间苯二酚单元中有一个横向氯原子，在侧臂中有各种连接单元。为了调整向列相的性质，我们改变了延长臂中连接单元的类型，刚性从苯甲酸酯、联苯、肉桂酸、希夫碱到苯乙烯基团。除此之外，我们还改变了侧取代基（氯）的位置。通过差示扫描量热法、偏光显微镜、介电光谱和x射线研究确定了材料的介晶性质。我们发现，连接单元与侧取代基的协同作用产生了广泛的中间相温度范围-向列相以及SmCP相。由于分子结构中光敏基团的存在，我们已经能够在紫外光下将两个中间相转变为各向同性相。利用从头计算方法讨论了化学结构-亚形态性质的关系，并结合实验数据给出了结果。
We present two isomeric series of photosensitive bent-core liquid crystals possessing a lateral chlorine atom in the central resorcinol unit and various linking units in the side arms. With the aim to tune properties of the nematic phase, we have varied the type of the linking unit in the lengthening arm with rising rigidity from benzoate ester, biphenyl, cinnamate, Schiff base to stilbene moieties. In addition to that, we have changed the position of the lateral substituent (chlorine) as well. The mesomorphic properties of the materials have been determined from differential scanning calorimetry, polarizing optical microscopy, dielectric spectroscopy and X-ray studies. We show that synergy of the linking unit with the effect of the lateral substituent gives rise to broad temperature range of mesophases — the nematic phase as well as a SmCP phase. Thanks to the presence of the photosensitive group in the molecular structure, we have been able to transform both mesophases to the isotropic phase under UV light. The chemical structure–mesomorphic properties relationships are discussed with the aid of ab initio calculations and the results presented in context with experimental data.
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影响因子：
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通讯作者：
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影响因子：
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