由于其对诸如温度,机械力以及电场和磁场之类的外部刺激的敏感性,表现出热致液晶性质的分子已经变得非常重要。结果,通过在芳族核附近以及在侧链中引入各种官能团,已经合成了几种新颖的介晶,并且已经研究了它们的性质。在本研究中,我们报告了在一个末端带有羟基的三环液晶元。这些介晶通过多步路线合成,并通过光谱技术完成结构表征。通过热阶段光学偏振显微镜,差示扫描量热法和小角X射线散射研究了中间相性质。较低的同系物发现了对映向列相,而较高的同系物则发现了另外的近晶C相。固态高分辨率自然丰度已经对固相和中间相中典型的液晶元进行了13 C NMR研究。层列碳相和向列相的液晶元的13 C NMR光谱表明该分子在磁场中自发排列。通过利用称为SAMPI4的二维分离局部场(SLF)NMR实验,获得了13 C– 1 H偶极耦合,这些耦合用于确定液晶元的取向顺序参数。
Synthesis and mesomorphic properties of novel Schiff base liquid crystalline EDOT derivatives
作者:Ashwathanarayana Gowda、Arun Roy、Sandeep Kumar
DOI:10.1016/j.molliq.2016.11.010
日期:2017.1
Herein, we reported novel banana liquid crystals derived from ethylenedioxythiophene (EDOT) central unit encompass with Schiff base. Structural charecterization of these compounds was carried out from their spectral and elemental analysis. Physical properties of all the newly synthesized compounds were investigated by polarising optical microscopy, differential scanning calorimetry, thermogravimetric