Azo-functionalised achiral bent-core liquid crystalline materials: effect of presence of –N=N– linkage at different locations in the molecular architecture
Azo-functionalised achiral bent-core liquid crystalline materials: effect of presence of –N=N– linkage at different locations in the molecular architecture
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DOI：
10.1080/02678292.2013.805831
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发表时间：
2013-08
期刊：
影响因子：
2.2
通讯作者：
N. Nagaveni;P. Raghuvanshi;A. Roy;V. Prasad
中科院分区：
文献类型：
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作者：
N. Nagaveni;P. Raghuvanshi;A. Roy;V. Prasad
在这里，我们报告了四种新的同系偶氮官能化非手性弯核化合物。本文讨论了四种新型同系系列光致变色材料的设计、合成和液晶性能。在这项研究中，我们研究了分子结构不同位置上存在的-N=N-键对介晶性质的影响。所有新合成的化合物的分子结构都是使用有机光谱方法建立的。使用偏光光学显微镜 (POM)、差示扫描量热法 (DSC)、X 射线衍射和电光研究研究液晶特性。它们表现出 B1 (colr) 和 B2 (SmCAPA) 中间相。我们发现分子结构中不同位置的-N=N-键的存在似乎对此类化合物的介晶行为没有太大影响。然而，我们清楚地看到-N=N-键的位置对这些化合物的光致电光性质的深远影响。
Here, we report four new homologous series of azo-functionalised achiral bent-core compounds. The paper deals with the design, synthesis and liquid crystalline properties of four new homologous series of photochromic materials. In this study, we have investigated the effect of the presence of –N=N– linkage at different locations of the molecular architecture, on the mesomorphic properties. The molecular structures of all the newly synthesised compounds are established using the organic spectroscopic methods. The liquid crystalline properties are investigated using polarising optical microscopy (POM), differential scanning calorimetry (DSC), X-ray diffraction and electro-optical studies. They exhibit B1 (colr) and B2 (SmCAPA) mesophases. We find that the presence of the –N=N– linkage at different locations in the molecular architecture does not seem to have much effect on the mesogenic behaviour of such compounds. However, we clearly see a profound effect of the location of the –N=N– linkage on the photo-induced electro-optical properties of these compounds.