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

International Journal of Molecular Sciences

Win-Long Chia¹  Ker-Non Kuo² 

[1]Department of Chemistry, Fu Jen Catholic University, New Taipei City 24205, Taiwan

关键词: liquid crystals;    kinked structure;    methylquinoline terminus;    mesomorphic behavior;   

DOI  :  10.3390/ijms15057579

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland