Synthesis and thermotropic studies of a novel series of nematogenic liquid crystals 2-(6-alkoxynaphthalen-2-yl)-5-cyanopyridines

Abstract

A novel series of highly birefringent liquid crystalline compounds, 2-(6-alkoxynaphthalen-2-yl)-5-cyanopyridines (nO-NpPyCN, n = 2–8) that have potential as commercially useful, were synthesised using a short two-step reaction with overall yields between 55% and 85%. Spectral analyses were in accordance with the expected structures. Their thermotropic behaviours were investigated by polarising optical microscopy and differential scanning calorimetry. It was found that the desymmetrised core results in a nematic phase with a broad mesophase range.

Keywords:

• synthesis
• liquid crystals
• pyridine compounds
• differential scanning calorimetry

Acknowledgements

Financial support of our work by the office of research and development of Fu Jen Catholic University is gratefully acknowledged.