Paraffinic Chains: The Observation of Static Dipolar Interactions in the Presence of Anisotropic Motional Narrowing
Potassium laurate CH3(CH2)10CO2K can be mixed with water to form a variety of phases depending on water content and temperature (Fig. 1). In the various liquid crystal phases, the phase is composed of aqueous regions and laurate regions, the interface being formed by the contiguous polar heads of the laurate molecules. The laurate molecules are in effect linear chains: in some phases the chains are straight and aligned, in others they are twisted and disordered. Furthermore it is known from nmr, spin labels and fluorescence studies that there is considerable local motion. Nevertheless x-ray scattering shows that the liquid crystal phases exhibit long range order. The interface surfaces form a lattice which can have cubic, lamellar or hexagonal symmetry.
KeywordsCorrelation Time Dipolar Interaction Free Precession Lamellar Phase Translational Diffusion
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- 1.J. CHARVOLIN and P. RIGNY, J.Chem.Phys. 58, 3999 (1973) and references quoted thereinGoogle Scholar
- 3.The average anisotropy in the lamellar phase has been studied by the quadrupolar splitting of deuteron nmr in oriented lamellae of perdeuterated laurate: J. CHARVOLIN, P. MANNEVILLE and B. DELOCHE, Chem.Phys.Lett. 23, 345 (1973)Google Scholar