Investigation of lipid + water systems. Part 6. Proton magnetic resonance in ordered lyotropic mesophases.
P.m.r. measurements have been made on macroscopically ordered samples of the smectic mesophase in two 1-monoglyceride + water systems and the 1-amino-octane + water system. Three doublets have been observed, one from hydroxyl protons, and the remaining two from methylene protons in two sections of the alkyl chain undergoing different types of molecular motion. The protons of the glyceryl residue also contribute to one of the alkyl chain doublets. The magnitudes of the doublet splittings have been measured at a number of different temperatures and compositions in each system. Some correlations have been made between the splittings obtained and the type of head group and the length and conformation of the alkyl chain. The effects of temperature change have been interpreted in terms of the increasing occurrence of gauche configurations in segments of the alkyl chain. Correlations have been made between degrees of order obtained from p.m.r. and d.m.r. spectra.
D001665:Binding Sites; D005989:Glycerides; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D013696:Temperature; D014867:Water
D005989:Glycerides; D014867:Water