Abstract
One or two amide groups were inserted as linking groups to prepare five-ring bent-core mesogens. Two isomeric series of each 8 compounds were investigated to study the influence of the position and direction of amide and ester connecting groups on the mesophase behaviour. The lateral attachment of halogen atoms to the outer phenyl rings offers a possibility to reduce the melting temperatures and to obtain materials forming mesophases in broad temperature ranges. Compounds with two amide groups show very high melting points. Shifting one of the terminal alkyloxy groups from the para into the meta position results in the loss of liquid crystalline phases. Liquid crystalline materials have been characterized by optical polarizing microscopy, DSC, X-ray diffraction measurements and electro-optical studies.
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