Aromatic liquid crystals with a trifluoromethyl group in the terminal chain for use in nematic LC mixtures

A new class of compounds suitable for LCD applications has have synthesized , incorporating a trifluoromethyl group in the terminal alkoxy or alkenylox y chain. These compounds fulfil many of the specifications for use in TN-LC Ds. Compounds containing several aromatic rings were synthesized with a vie w to producing compounds of high birefringence. This aspect also included t he synthesis of compounds containing a carbon-carbon triple bond. Materials with three phenyl rings were also prepared in an attempt to product nemati c liquid crystals with a high clearing point and a high birefringence. Mole cules containing a lateral fluoro substituent were synthesized in order to generate a high positive value of the dielectric anisotropy, a low melting point and no smectic mesophases. A series of compounds incorporating a carb on-carbon double bond was prepared in an attempt to produce compounds with a high nematic clearing point and a high birefringence.