Abstract
We prepared a nonsymmetric dimesogenic liquid crystal (1) in which a 2,3-difluoro-1,4-diphenylbenzene unit and a 4-(4-fluorophenyl)benzene unit were connected via a flexible spacer, and investigated the physical properties. For comparison, we also investigated those of the corresponding monomesogenic compounds, 4-(4-hexylphenyl)-1-(4-hexyloxypheny)-2,3-difluorobenzene (2) and 4-(4-fluorophenyl)-1-hexyloxybenzene (3). Compound 1 exhibited a nematic phase with a wide temperature range, whereas an equimolecular mixture of compounds 2 and 3 showed nematic and smectic A phases. Both compound 1 and the mixture showed a positive dielectric anisotropy of 0.2 at TIN-10 °C in the nematic phase. However, they showed a marked difference in electrooptical response. We discuss the oligomeric effects of compound 1 on the physical properties.
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