E. Dietzmann et W. Weissflog, LATERALLY BRANCHED MESOGENS INCORPORATING A RIGID PERFLUOROALKYL CHAIN, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 299, 1997, pp. 419-426
We synthesized laterally aryl substituted mesogens derived from isopht
halic acid (type A) and resorcylic acid (type B) containing a fluorina
ted alkyl-alkoxy chain in a terminal position. An increase of the clea
ring 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.