SOLID-STATE AL-27 AND CROSS-POLARIZATION C-13 MAGIC-ANGLE-SPINNING NUCLEAR-MAGNETIC-RESONANCE CHARACTERIZATION OF ALUMINAS DERIVED FROM BASIC ALUMINUM SUCCINATE

Solid-state Al-27 and cross-polarization (CP) C-13 magic-angle spinnin g nuclear magnetic resonance (MAS NMR) was used to characterise alumin as obtained by calcining basic aluminium succinate at different temper atures. In basic aluminium succinate, aluminium is in the tetrahedral coordination only. However, in both X-ray amorphous and gamma-aluminas aluminium is in the tetrahedral and octahedral coordination. The inte nsity of the aluminium peaks is at a maximum for samples calcined at 7 00-degrees-C. C-13 CP MAS NMR indicates the bonding of Al with carbon of the carboxylate group in basic aluminium succinate. Samples calcine d at 400-870-degrees-C do not give C-13 spectra.