An NMR Study of the Anisotropic Forces Acting on the Segments of Ammonia and Phosphine in Liquid Crystals

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Abstract
The dipolar couplings of ammonia and phosphine have been measured in various types of liquid crystals. Striking inconsistencies are cncountered if the conventional analysis of these dcouplings is attempted. It is shown that a recently introduces new method of analysis, allowing for the correlation between the molecular reorientational and vibrational motion, is capable of explaining the couplings by resonable values of the liquid acting on the bonds and lone-pair electron clouds of the molecules in the liquid crystal surroundings. These torques display the same trends as those acting on the bonds of several other small molecules studied earlier, suggesting that there is a common interaction mechanism, possibly the van der Waals interaction, behind these forces.