The effect of terminal alkoxy chain on mesophase behaviour, optical property and structure of chiral liquid crystal compounds derived from (-)-menthol

Herein, we present the results of our extensive investigations on the synthesis and phase behaviour of nine novel (-)-menthol-based chiral liquid crystal compounds. They possess three phenyl rings and substituted with (-)-menthyl and varying length of n-alkoxy chains at one end. With the aim of exploring the fundamental relationships between molecular structural features and thermal properties, nine terminal n-alkoxy groups from ethoxy to n-octadecaneloxy group in even numbers have been used. A detailed characterisation of their properties was carried out. The characterisation results clearly illustrate that all the series compounds show the thermodynamically stable phases; the shorter chain homologues display only the BPI and N-* phases, and the middle ones exhibit BPI, N* and S-A* phases while the longer chain members show the BPI, N-* and S-c* phases. Besides, the BPI appeared in a narrow temperature range because of their thermodynamic disruption. Temperature range of the N-* phase narrows when the length of the n-alkoxy tail increases. The reflection peak is shifted towards short wavelength region with increasing temperature due to the winding of the chiral nematic helix in the N-* phase. Furthermore, their inherent reflection peak intensities of reflections were gradually weakened. [GRAPHICS] .