Abstract
We have prepared novel preorganized compounds in which 4-(4-fluorophenyl)phenyl and 4-(trifluoromethoxy)phenyl are connected via a rigid catechol unit or a flexible spacer and investigated their structural effects on the induced dielectric anisotropy in the mixture with a host material. The nonsymmetric bimesogenic compounds with the flexible spacer were found to be a dopant with negative dielectric anisotropy in host A composed of fluoro-substituted phenyl esters, whereas they were found to be a dopant with large positive dielectric anisotropy in host B (6OCB). The rigid U-shaped compound enhanced Δe in both hosts A and B. We discuss effects of host−guest interaction on conformational change of the guest molecule in the nematic liquid crystalline phase.
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