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A new series of teraryl 2-(4-alkoxybiphen-4′-yl)-5-methylpyridines ( n O-PPPyMe,  n  = 3–8) nematic liquid crystal compounds, bearing a biphenylene core and a picoline terminus, were synthesized using a short two-step reaction, and overall yields between 34% and 38% were obtained. Spectral analysis results were in accordance with the expected structures. The thermotropic behavior of the teraryl liquid crystal compounds was investigated through polarized optical microscopy and differential scanning calorimetry. All compounds exhibited a solely enantiotropic nematic phase at the medium–high temperature range of 162.4–234.2 °C. Furthermore, the results for the  n O-PPPyMe series were analyzed relative to three other compound series,  m O-PPPyCN ( m  = 2–8),  i O-PPQMe ( i  = 3–8) and  x O-PPyPMe ( x  = 1–10). Consequently, the effect of pyridine on the mesophase of teraryl liquid crystals was demonstrated.

international journal of molecular sciences

Effect of Pyridine on the Mesophase of Teraryl Liquid Crystals: A New Series of Nematic Liquid Crystals Named 2-(4-Alkoxybiphen-4′-yl)-5-methylpyridines