Quadrupole and chemical shift interactions of AL-27 in aluminium molybdate from satellite transition magic angle spinning NMR

Aluminium molybdate (Al-2(MoO4)(3)) contains four inequivalent aluminium sites spread over an isotropic chemical shift range of only approximate to 3 ppm. Satellite transition magic angle spinning NMR spectroscopy is employed to deduce the quadrupole (both C-q and eta) and isotropic chemical shift interactions at the four sites for the first time

Quantification of Aluminum Coordinations in Amorphous Aluminas by Combined Central and Satellite Transition Magic Angle Spinning NMR Spectroscopy

An amorphous alumina formed by partial dehydration of gibbsite is characterized by observation and simulation of the central and satellite transitions of Al-27 magic angle spinning NMR spectra. The improved resolution of the AlO4, AlO5, and AlO6 sites in the (+/-3/2, +/-1/2) transitions allows the individual sideband manifolds to be simulated so that the NMR interaction parameters and the distribution of the quadrupolar interaction of each coordination can be deduced. Based on these parameters, simulation of the centerband provides the most accurate information to date on the distribution of aluminum between the three coordinations in an amorphous alumina