AL-27(H-1) CROSS-POLARIZATION TRIPLE-QUANTUM MAGIC-ANGLE-SPINNING NMR

An experiment is described that produces multiple-quantum magic angle spinning (MQMAS) NMR spectrum of Al-27 via H-1 cross polarization (CP) . An application of this new technique to the study of a fully hydrate d AlPO4-11 aluminophosphate is presented. It is shown that a combinati on of MQMAS and CPMQMAS provides new insight into the structure of thi s sample. While MQMAS alone can be used to obtain high-resolution spec tra and quantitative information on the distribution of Al sites, CPMQ MAS allows one to establish the positions of water molecules within th e ALPO(4)-11 framework.