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

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

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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.
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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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