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Int. J. Mol. Sci. 2014, 15(5), 7579-7593; doi:10.3390/ijms15057579

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

Department of Chemistry, Fu Jen Catholic University, New Taipei City 24205, Taiwan
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Author to whom correspondence should be addressed.
Received: 11 March 2014 / Revised: 15 April 2014 / Accepted: 22 April 2014 / Published: 2 May 2014
(This article belongs to the Special Issue Advances in Anisotropic and Smart Materials)
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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. View Full-Text
Keywords: liquid crystals; kinked structure; methylquinoline terminus; mesomorphic behavior liquid crystals; kinked structure; methylquinoline terminus; mesomorphic behavior
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Chia, W.-L.; Kuo, K.-N.; Lin, S.-H. 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. Int. J. Mol. Sci. 2014, 15, 7579-7593.

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