Abstract
Several new experiments are reviewed that combine multiple quantum magic angle spinning (MQMAS) NMR with cross polarization (CP) or heteronuclear recoupling via REDOR. The advantage of these techniques is that they provide direct inference of the connectivities between spin- 1/2 and half-integer quadrupolar nuclei in the isotropic spectra of the latter. Additionally, the MQ- REDOR methods yield the internuclear distances in these systems. We have demonstrated the capabilities of these techniques in the studies of 1H-27A1 and 19F-27A1 spin pairs in aluminophosphate molecular sieves.
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