Dielectric Constants and Molecular Structure of Nematic Liquid CrystalsII. Variation of the Bridging Group

Abstract

Measurements are presented of the dielectric constants of some nematic compounds with the structure CHaO-^-X-O-CsHuThe following bridging groups X are considered: C=C, CH = CH, CC1 = CH, N = N, CH = N, N = CH, CO -O and O -CO. Starting from the compounds with non-polar bridging groups the influence of the group X on the dielectric properties is systematically evaluated.