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The location of the fluoride ion in tetrapropylammonium fluoride silicalite-1 (TPA-F-Si-MFI), an as-synthesized siliceous zeolite with the MFI topology, has been unambiguously determined using solid-state NMR experiments alone. With the 1 H→ 29 Si CP-INADEQUATE experiment, the 12 peaks in the highly resolved 29 Si MAS NMR spectrum of TPA-F-Si-MFI were assigned. Using these peak assignments it was possible to perform 1 H/ 19 F/ 29 Si triple resonance CP, REDOR, and TEDOR experiments to measure F−Si distances and thus locate the fluoride ion. It is covalently bonded to Si-9 in the 4 1 5 2 6 2 cage of the zeolite framework and exchanges between two “mirror-related” Si-9 sites, making them equivalent on the NMR time scale. The importance of this result and the general applicability of the approach are discussed.
Fyfe et al. (Wed,) studied this question.