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Columnar liquid crystalline phases through hydrogen bonding and nanoscale segregation

: Goldmann, D.; Janietz, D.; Schmidt, C.; Wendorff, J.H.


Journal of Materials Chemistry 14 (2004), No.10, pp.1521-1525
ISSN: 0959-9428
Journal Article
Fraunhofer IAP ()

Two columnar phases forming 2,4,6-triarylamino-1,3,5-triazines have been investigated in binary mixtures with calamitic and non-liquid crystalline benzoic acids carrying one or two alkoxy chains at the aromatic core. The triazines form hydrogen bonded aggregates with the complementary acids. Each investigated equimolar mixture exhibits a columnar mesophase due to segregation of the H-bonded polar core region from the lipophilic aliphatic molecular segments. The cross sectional shape of cylindrical aggregates and, therefore, the two-dimensional lattice symmetries, hexagonal or rectangular, are defined by the number of alkoxy chains of the benzoic acid component.