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Multiple-quantum magic-angle spinning and double-rotation NMR techniques were applied in the high field of 17.6 T to the study of oxygen-17-enriched zeolites A and LSX with the ratio Si/Al=1. A monotonic correlation between the isotropic value of the chemical shift and the Si–O–Al bond angle α (taken from X-ray data) could be found. Hydration of the zeolites causes a downfield 17 O NMR chemical...
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