N.M.R. of methanes in liquid crystal mixtures

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Abstract
Dipolar and quadrupolar couplings are reported for methane and its deuterated analogues dissolved in the liquid crystals Merck ZLI 1132, N-(p-ethoxybenzylidene)-p′-n-butylaniline, and a mixture of these liquid crystals. Previous studies indicate that D2 dissolved in the same mixture has almost zero orientational order. This was interpreted as a reduction in the average electric field gradient on mixing. It is shown that methane in the same mixture and in its constituents experiences the same average field gradients as D2. Moreover, provided one does not neglect the variation of the relevant molecular tensors with bond stretching, the dipolar couplings of methane dissolved in liquid crystals can be described with a bond-additivity model.