Nematic phase n.m.r. spectra of pyridine-4-aldehyde have been interpreted and the relative geometry of the ring hydrogens derived. The spectra show unambiguously that the rotation of the aldehyde substituent is slower than, or of the same order as, the reorientational motion of the solute molecules in the liquid crystal phase.
K. G. Orrell and V. Šik, J. Chem. Soc., Faraday Trans. 2, 1976, 72, 941 DOI: 10.1039/F29767200941
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