两个新型扭曲液晶系列的合成和热致性研究：2-(4'-烷氧基联苯-4-基)-6-甲基喹啉和 2-(6-烷氧基萘-2-基)-6-甲基喹啉。

Synthesis and thermotropic studies of two novel series of kinked liquid crystals: 2-(4'-alkoxybiphen-4-yl)-6-methylquinolines and 2-(6-alkoxynaphthalen-2-yl)-6-methylquinolines.

机构信息

Department of Chemistry, Fu Jen Catholic University, New Taipei City 24205, Taiwan.

出版信息

Int J Mol Sci. 2014 May 2;15(5):7579-93. doi: 10.3390/ijms15057579.

DOI:10.3390/ijms15057579

PMID:24798752

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC4057692/

Abstract

Two novel homologous series of kinked (Z-shaped) liquid crystalline compounds were synthesized using a short two-step reaction. Yields of 30%-40% and 51%-57% were obtained for 2-(4'-alkoxybiphen-4-yl)-6-methylquinolines (nO-PPQMe, n = 3-8) and 2-(6-alkoxynaphthalen-2-yl)-6-methylquinolines (iO-NpQMe, i = 3-7), respectively. Spectral analyses agreed with the expected structures. The thermotropic behaviors of these compounds were investigated using polarized optical microscopy and differential scanning calorimetry. An enantiotropic nematic phase appeared to be the main mesophase in these two series of kinked liquid crystalline compounds, and an additional enantiotropic smectic C phase appeared when n = 8.

摘要

两个新型的扭曲（Z 型）液晶化合物同系物是通过两步短反应合成的。2-（4'-烷氧基联苯-4-基）-6-甲基喹啉（nO-PPQMe，n=3-8）和 2-（6-烷氧基萘-2-基）-6-甲基喹啉（iO-NpQMe，i=3-7）的产率分别为 30%-40%和 51%-57%。光谱分析与预期结构一致。使用偏光显微镜和差示扫描量热法研究了这些化合物的热致性行为。各向异性向列相似乎是这两个扭曲液晶化合物同系物中的主要介晶相，当 n=8 时，还出现了各向异性的近晶 C 相。