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Influence of a quadrupole nucleus of the signal of an adjacent to it 1/2 spin nucleus in high resolution NMR spectra of liquid samples

Gryff-Keller A.

Bulletin of the Polish Academy of Sciences. Chemistry

1998

Vol. 46, No. 1

105-115

In high resolution NMR spectra of liquid samples a signal of a nucleus A (I =1/2) scalar coupled with a higher spin nucleus X reflects the relaxation properties of the latter nucleus. This signal may have the form of a singlet or a more or less resolved multiplet with characteristic relative broadenings of individual lines. Recently some spectroscopic effects, earlier predicted by theory, which manifest themselves in unsymmetrical lineshapes of the signal of A, have been reported. Measurements of the scalar relaxation of the second kind or the lineshape analysis of the A signal may provide valuable information on molecular structure and dynamics. In this paper the above phenomena have been reviewed and illustrated with experimental examples.