Spin Decoupling and Double Resonance

FIGURE 5.3 Collapse of spin splitting in methanol with increase in temperature. Both the CH3 and OH proton resonances are shown. 

The presence of spin coupling provides much of the richness of NMR spectra, not only because of the information on bonding and conformation that we can infer from the magnitudes of coupling constants but also because spin information can be transferred from one nucleus to another by means that we shall explore in later 

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