~27Al{~1H} Cross Polarization Triple-Quantum Magic Angle Spinning NMR

摘要

An experiment is described that produces multiple-quantum magic angle spinning (MQMAS)NMR spectrum of ~27Al via ~1H cross polarization (CP). An application of this new technique to the study of a fully hydrated AlPO_4~- 11 aluminophosphate is presented. It is shown that a comcination of MQMASA and CPMQMAS provides new insight into the structure of this ample. While MQMAS alone can be used to obtain high-resolution spectra and quantitative information on the distribution of Al sites. CPMQMAS allows one to establish the positions of water molecules within the AlPO_4~-11 framework.