Abstract
The aim of this study is to distinguish the effect on the chemical shift of the anisotropy of sample magnetism (shape, chemical composition, external magnetic field B 0) from the local effect (binding electron, neighbouring nuclei) for NMR experiments. We calculate the former for an angle θ=54°44″ (magic angle) between the B 0 direction and the axis of the rotor. For a small adsorption rate of p-fluoroacetophenone on MFI and FAU-type zeolites, this effect on 19F chemical shift is not negligible, and it depends on the zeolite nature and structure type. The δ obs correction varies from +1.8 ppm for MFI with Si/Al ≥35.5 to about +1.4 ppm for FAU zeolites with Si/Al=2.9 and 21.
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