An NMR lineshape study of pyridine dissolved in nematic PCH mesophase has been carried out. Measurements of spectral frequencies and intensities enabled us to determine the order parameters defining the molecular orientation. Lineshape analysis indicates that the highly selective broadening of lines is mainly due to the coupling of protons with the rapidly relaxing14N quadrupolar nucleus. A further contribution to the line width comes from the dipolar intermolecular relaxation mechanism. The quadrupolar relaxation time of the14N nucleus and the correlation time of the intermolecular interaction were calculated. Â© 1987.
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