Chia Win-Long, Huang Yu-Sin
Department of Chemistry, Fu Jen Catholic University, New Taipei City 24205, Taiwan.
Int J Mol Sci. 2016 Mar 7;17(3):344. doi: 10.3390/ijms17030344.
A new series of teraryl 2-(4-alkoxybiphen-4'-yl)-5-methylpyridines (nO-PPPyMe, n = 3-8) nematic liquid crystal compounds, bearing a biphenylene core and a picoline terminus, were synthesized using a short two-step reaction, and overall yields between 34% and 38% were obtained. Spectral analysis results were in accordance with the expected structures. The thermotropic behavior of the teraryl liquid crystal compounds was investigated through polarized optical microscopy and differential scanning calorimetry. All compounds exhibited a solely enantiotropic nematic phase at the medium-high temperature range of 162.4-234.2 °C. Furthermore, the results for the nO-PPPyMe series were analyzed relative to three other compound series, mO-PPPyCN (m = 2-8), iO-PPQMe (i = 3-8) and xO-PPyPMe (x = 1-10). Consequently, the effect of pyridine on the mesophase of teraryl liquid crystals was demonstrated.
通过两步短反应合成了一系列新型的含联苯撑核心和甲基吡啶端基的芳基 2-(4-烷氧基联苯-4'-基)-5-甲基吡啶(nO-PPPyMe，n = 3 - 8)向列型液晶化合物，总产率在34%至38%之间。光谱分析结果与预期结构相符。通过偏光显微镜和差示扫描量热法研究了芳基液晶化合物的热致行为。所有化合物在162.4 - 234.2 °C的中高温范围内均呈现单一的互变向列相。此外，相对于其他三个化合物系列mO-PPPyCN(m = 2 - 8)、iO-PPQMe(i = 3 - 8)和xO-PPyPMe(x = 1 - 10)对nO-PPPyMe系列的结果进行了分析。结果表明了吡啶对芳基液晶中间相的影响。
