Chia Win-Long, Liu Chih-Wei
Department of Chemistry, Fu Jen Catholic University, New Taipei City 24205, Taiwan.
Int J Mol Sci. 2015 Apr 2;16(4):7520-34. doi: 10.3390/ijms16047520.
A new series of 2-(6-alkoxynaphthalen-2-yl)-6-methoxyquinolines (nO-NpQOMe, n = 3-8) liquid crystal compounds, a linear molecular structure with two kinks, were synthesized using a short two-step reaction with overall yields between 43% and 58%. Spectral analyses were in accord with the expected structures. Thermotropic behavior of these liquid crystal compounds were investigated using polarized optical microscopy and differential scanning calorimetry. All compounds exhibited purely enantiotropic nematic phase at the medium-high temperature range of 162.4-234.2 °C. However, short ranges of nematic phase, 20.5-16.6 °C at heating and 46.7-37.0 °C at cooling, were observed in these linear liquid-crystalline compounds with two kinks.
合成了一系列新的2-(6-烷氧基萘-2-基)-6-甲氧基喹啉（nO-NpQOMe，n = 3 - 8）液晶化合物，其具有带有两个弯折的线性分子结构，通过两步短反应合成，总产率在43%至58%之间。光谱分析与预期结构相符。使用偏光显微镜和差示扫描量热法研究了这些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纯单变向列相。然而，在这些带有两个弯折的线性液晶化合物中，观察到了短程的向列相，加热时为20.5 - 16.6 °C，冷却时为46.7 - 37.0 °C。
