Abstract
The structure of benzene dissolved in various thermotropic nematic liquid crystals has been studied. 13C-methane was used as an internal “deformation reference”. The results indicate that the HH distance ratios obtained front the direct dipole-dipole coupling constants correspond to the hexagon values in cases where benzene is dissolved in mixtures of nematic liquid crystals which produce negligible dipolar CH splittings for methane. The ratio r CH/ r CC for benzene is in good accord with the value obtained by other spectroscopic means. The proton structure of benzene in the smectic and nematic phases of p, p′-di- n-heptylazoxybenzene (HAB), however, does not follow the general trend observed in the purely nematic phases. But the dipolar CH splitting of methane also behaves inconsistently.
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