2009•Liquid CrystalsRequires access

Synthesis and mesomorphic behaviour of new 5‐substituted 4‐(thien‐2‐yl)phenyl benzoates

Yi Huang, Zhiwu Luo, Xiaohong Cheng, Carsten Tschierske

Abstract

4‐(5‐Alkylthien‐2‐yl)phenyl 4‐alkoxybenzoates and 4‐(5‐cyanothien‐2‐yl)phenyl 4‐alkoxbenzoates are synthesised by using Pd (0) catalysed coupling reactions as key steps. The thermotropic liquid crystalline behaviour of these compounds is investigated using polarised optical microscopy (POM) and differential scanning calorimetry (DSC). Broad temperature ranges of nematic and/or smectic A mesophases are found in these compounds. The influence of the length of the alkoxy chains and molecular polarisability on the mesophase behaviours is discussed.

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Key concepts: Thermotropic crystal, Mesophase, Liquid crystal, Differential scanning calorimetry, Materials science, Benzoates, Optical microscope, Crystallography