Analysis of Spin-Spin Multiplets in Nuclear Magnetic Resonance Spectra

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Abstract
A systematic procedure is developed for the analysis of the spin‐spin multiplets that are observed in the high‐resolution NMR (nuclear magnetic resonance) spectra of liquids. It is shown how the symmetry properties of nuclear spin functions can be used to simplify the interpretation of NMR multiplets in terms of the empirical quantities, chemical shifts, and spin‐spin coupling constants. It is also pointed out that when NMR multiplets have been properly interpreted in terms of these empirical quantities, it is then possible to predict theoretically relative intensities of multiplets to the same degree of precision as that involved in the measurement of multiplet frequency separations. As an example the multiplet splittings of the H1 and F19 resonances in 1,1‐difluoroethylene are analyzed using the procedure proposed in the present paper.