Laterally branched mesogens incorporating a rigid perfluoroalkyl chain

We synthesized laterally aryl substituted mesogens derived from isophthalic acid (type A) and resorcylic acid (type B) containing a fluorinated alkyl-alkoxy chain in a terminal position. An increase of the clearing points and a stabilization of the smectic phases compared to the nonfluorinated references appear in all cases. Hereby, the position is not important for the height of the transition temperatures. There is a dependence on the number of methylene units between the oxygen and the fluoro-carbon groups in the type A derivatives.