Deuterium NMR studies of n-octyl-, n-nonyl-, n-decyl-D-glucopyranoside liquid crystalline systems

Abstract

We report measurements of the deuterium NMR spectra of the lyotropic systems n-octyl-, n-nonyl- and n-decyl-β-D-glucopyranosides with D₂O and C₆D₆. From these spectra the phase diagrams are constructed and include lamellar, hexagonal and isotropic (presumably cubic) phases. The details of the phase diagrams depend upon the sugar homologue and the solvent. The results can be understood qualitatively by considering some of the factors which determine the nature of the phases in these systems. The deuterium spectra belonging to the OD groups in the polar heads of n-octyl-α-D-glucopyranoside dissolved in C₆H₆ were measured and compared with analogous spectra, which were reported previously, of the same compound in D₂O.