Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Hydrogen-bonded polyphilic block mesogens with semiperfluorinated segments

 
: Kohlmeier, A.; Janietz, D.

:

Chemistry of Materials 18 (2006), Nr.1, S.59-68
ISSN: 0897-4756
ISSN: 1520-5002
Englisch
Zeitschriftenaufsatz
Fraunhofer IAP ()

Abstract
Two 2,4-diamino-6-phenyl-1,3,5-triazines carrying either one or two alkoxy chains at the phenyl substituent have been investigated in binary mixtures with two-chain partially fluorinated benzoic acids. Equimolar compositions of the complementary molecular species form discrete hydrogen-bonded dimeric supermolecules. The dimers organize to infinite ribbons of parallel aligned H-bonded polar aromatic cores that are separated by mixed aliphatic/fluorinated regions. The cross-sectional shape of the ribbon aggregates and, therefore, the two-dimensional lattice symmetries of the ribbon phases, rectangular or oblique, are defined by the number of alkoxy chains of the triazine component. Docking of 2 or 3 equiv of the semiperfluorinated benzoic acids to the diaminotriazine core leads to H-bonded aggregates with a circular cross-sectional shape and, consequently, to the formation of columnar phases on a two-dimensional hexagonal lattice.

: http://publica.fraunhofer.de/dokumente/N-60076.html