HIGH-FIELD O-17 NMR-STUDIES OF THE SIOAL BOND IN SOLIDS

Oxygen-17 multiple-quantum magic-angle spinning and double rotation nu clear magnetic resonance studies were performed in the field of 17.6 T . A correlation between the isotropic value of the chemical shift and the SiOAl bond angle in zeolites was found. The correlation may be use d for the determination of bond angles in SiOAl sites without long-ran ge order. It is shown that multiple-quantum and double rotation techni ques are complementary tools for getting highly-resolved O-17 NMR Spec tra of solids. (C) 1998 Elsevier Science B.V. All rights reserved.