Mesomorphic behaviour, optical and quantum computational study: Effect of electron density on newly synthesized liquid crystalline positional isomers
作者:Akshay Vyas、Rohit R. Koshti、H.N. Patel、Chetan B. Sangani、A.K. Prajapati、Yongfang Yao、Yong-Tao Duan
DOI:10.1016/j.molliq.2021.118142
日期:2022.3
Effect of position isomer in newly synthesized two liquid crystalline series having nitro and chloro groups at terminal and lateral position, with imine and cinnamoyloxy linkages was studied. The nitro and chloro groups in the aromatic end of the molecule are interchanged with each other at terminal and lateral position, giving rise to positional isomers. All synthesized compounds were characterized
研究了位置异构体在新合成的两个液晶系列中的影响,在末端和侧位具有硝基和氯基团,并带有亚胺和肉桂酰氧基键。分子芳族末端的硝基和氯基在末端和横向位置相互交换,产生位置异构体。所有合成的化合物都用标准光谱技术、红外、紫外和质子磁共振光谱进行表征。通过配备加热台的偏光光学显微镜观察中间相行为,并通过差示扫描量热法与中间相转变的相应转变焓确认。两个制备系列的介晶衍生物均显示向列型和近晶型 A 中间相。DFT 方法用于获得优化的分子几何形状。优化后的几何结构用于获得制备系列的分子静电势图、偶极矩、HOMO-LUMO 和扭曲角。基于静电势和HOMO-LUMO研究了分子间的相互作用。将当前两个系列的相变相互比较,并与三种结构相关的化合物进行比较,以评估平面度、中心连接和取代位置对其中间相行为的影响。