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Axial–biaxial phase transition in discotic liquid crystals, studied by deuterium NMR

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Zimmermann,  Herbert
Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society;
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;
Zimmermann Group, Max Planck Institute for Medical Research, Max Planck Society;
Emeritus Group Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Goldfarb, D., Belsky, I., Luz, Z., & Zimmermann, H. (1983). Axial–biaxial phase transition in discotic liquid crystals, studied by deuterium NMR. The Journal of Chemical Physics, 79(12), 6203-6210. doi:10.1063/1.445804.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-AFB4-2
Abstract
Truxenehexaalkanoates (TxHAn) exhibit a variety of discotic mesophases including the sequence ND⇄Drd⇄Dho. The ordering characteristics of these phases were studied by deuterium NMR of deuterated solutes, in particular C6D6. The results indicate that during the phase transition the minor susceptibility axis of the Drd phase transforms into the director axis of the axial phases. It is suggested that in the Drd phase, in alternating columns the mesogen molecules are tilted with respect to the columns axes in opposite directions.