Abstract
A deuterium NMR investigation of C6D6 dissolved in the discotic mesogen octa-O-decanoyl-β-cellobiose (Cel-II-10) is reported. The liquid-crystalline phase was found to be uniaxial in agreement with a previous X-ray study. The influence of magnetic field strength and thermal treatment on the mesophase alignment was investigated. From 2H NMR lineshape simulations, the form of the director distribution function was estimated. In contrast to most discotics, the columns of Cel-II-10 orient parallel to the external field indicating that the anisotropic diamagnetic susceptibility of this mesophase is positive. An increase of the quadrupolar splitting of C6D6 was observed when the sample was heated. This behaviour is interpreted in terms of a fast dynamic equilibrium between different solvation sites in the carbohydrate liquid crystal. The 2H NMR spectra recorded in the solid phase also indicated an exchange process between several sites.
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