Abstract
Rotary resonance recoupling of heteronuclear 13 C− 1 H dipolar interactions in magic angle spinning solid state 13 C NMR spectra (recorded under conditions of 1 H decoupling at frequency ν 1 and magic angle spinning at frequency ν r) has been studied for three examples of molecular solids (adamantane, ferrocene and hexamethylbenzene) in which substantial molecular motion is known to occur. It is shown that when rotary resonance conditions are satisfied (i.e. ν 1/ ν r= n, for n=1 or 2), the recoupling can lead to motionally averaged Pake-like powder patterns from which information on 13 C− 1 H internuclear distances and/or molecular motion can be derived.
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