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Hydrogen-bonded block mesogens with fluorinated molecular fragments

: Janietz, D.; Kohlmeier, A.


Molecular Crystals and Liquid Crystals 509 (2009), pp.39/781-67/788
ISSN: 0026-8941
ISSN: 1542-1406
Journal Article
Fraunhofer IAP ()

An alkoxyphenyl substituted melamine derivative has been investigated in binary mixtures with a two-chain semiperfluorinated benzoic acid. The two components are non-liquid crystalline in their own right. Equimolar mixtures of the melamine with the complementary benzoic acid form discrete hydrogen-bonded heterodimers. The dimeric supermolecules exhibit an induced rectangular columnar mesophase with two-dimensional c2mm lattice symmetry. The columnar phase represents a ribbon phase resulting from the collapse of smectic bilayers. Docking of two or three equivalents of the two-chain benzoic acid to the melamine core leads to the induction of hexagonal columnar mesophases.