Proton NMR spectra of oriented smectic phases of terephtal-bis-(p-n-butylaniline) (TBBA) are reproted. Spectra of the liquid crystal, as well as of methylenechloride dissolved as a probe molecule in this material, were taken. In both cases the behavior as function of temperature and under sample rotation relative to the magnetic field was studied. Each of the smectic A, B and C phases exhibits a typical behavior. That in the smectic C phase can be explained in terms of a model in which the molecular orientation can adjust freely on a cone while maintaining a constant tilt angle with respect to the smectic layers. It is concluded that NMR may be a useful tool in classifying smectic phases.
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Meiboom et al. (1973) studied this question.
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