68. Liquid Crystals with Large Negative Dielectric Anisotropy. Part V

Article abstract of DOI:10.1002/hlca.19850680311

Liquid crystals with negative Δε can be obtained by incorporating a cyano group in the terminal alkyl substituent or in an ethylene bridge between the cyclic units of the rigid core.The clearing points of such compounds are higher than those of the corresponding derivatives where the cyano group is laterally attached to a phenyl moiety.In compounds where both cyclic units of the rigid core are cyclohexyl, this type of substitution leads to an optimal contribution to ε<*> in contrast to the cyanophenyl derivatives.