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Title: Thermotropic Phase Behavior of Trialkyl Cyclohexanetriamides
Authors: Tomatsu, Itsuro ×
Fitie, Carel F. C
Byelov, Dmytro
de Jeu, Wim H
Magusin, Pieter
W├╝bbenhorst, Michael
Sijbesma, Rint P #
Issue Date: Oct-2009
Publisher: Amer chemical soc
Series Title: Journal of physical chemistry b vol:113 issue:43 pages:14158-14164
Abstract: The thermotropic phase behavior of symmetric cyclohexanetriamides carrying various linear and branched alkyl chains was investigated using calorimetry, microscopy, solid-state NMR, dielectric relaxation spectroscopy, and X-ray scattering techniques. Cyclohexanetriamides carrying C-6 or longer linear alkyl chains formed columnar plastic phases with a pseudocentered rectangular lattice. Those with C-8 or longer alkyl chain also showed a nematic liquid crystalline phase. Cyclohexanetriamides carrying branched octyl chains displayed columnar phases with rectangular lattices, except for the triamide with the highly branched tetramethylbutyl group. The occurrence of less symmetrical columnar phases is ascribed to the mode of stacking of cyclohexanetriamides which leads to noncylindrical columns. Dielectric relaxation spectra also featured highly cooperative relaxation processes related to reorientation of the macrodipolar columns in the mesophase, showing the potential of these molecules as building blocks in responsive materials.
ISSN: 1520-6106
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Soft Matter and Biophysics
Centre for Surface Chemistry and Catalysis
× corresponding author
# (joint) last author

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