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Int. J. Mol. Sci. 2013, 14(9), 18809-18823; doi:10.3390/ijms140918809

Synthesis and Thermotropic Studies of a New Series of Teraryl Liquid Crystals 2-(4'-Alkoxybiphen-4-yl)-5-Cyanopyridines

Department of Chemistry, Fu Jen Catholic University, New Taipei City 24205, Taiwan
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Author to whom correspondence should be addressed.
Received: 13 August 2013 / Revised: 30 August 2013 / Accepted: 6 September 2013 / Published: 12 September 2013
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Abstract

A new series of teraryl 2-(4'-alkoxybiphen-4-yl)-5-cyanopyridines (nO-PPPyCN, n = 2–8) compounds, bearing a cyanopyridine terminus, were synthesized using a short 2-step reaction with overall yields between 33% and 69%. Spectral analyses were in accord with the expected structures. Thermotropic behavior of the teraryl compounds was investigated using polarised optical microscopy and differential scanning calorimetry. All compounds exhibited both enantiotropic nematic and smectic A phases, with an additional enantiotropic smectic C phase when n = 7 and 8. Polymesomorphism appears to be a common behavior in this series of linear liquid crystal compounds.
Keywords: liquid crystals; teraryl compounds; cyanopyridine terminus; mesomorphic behavior liquid crystals; teraryl compounds; cyanopyridine 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.; Lin, X.-M. Synthesis and Thermotropic Studies of a New Series of Teraryl Liquid Crystals 2-(4'-Alkoxybiphen-4-yl)-5-Cyanopyridines. Int. J. Mol. Sci. 2013, 14, 18809-18823.

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