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- W2012111343 abstract "19F/29Si Hartmann–Hahn continuous wave cross-polarization (CP) has been applied under fast magic-angle spinning (MAS) to a powder sample of octadecasil. Strong oscillations occur during CP on a sideband matching condition between the isolated 29Si–19F spin pairs formed by the silicons in the D4R units and the fluoride anions. The magnitude of the dipolar coupling constant was deduced directly from the line-splitting between the intense singularities of the Pake-like patterns obtained by Fourier transformation of the oscillatory polarization transfer. The corresponding Si–F internuclear distance, r=2.62±0.05 Å, is found to be in very good agreement with the X-ray crystal structure and the value of 2.69±0.04 Å recently reported from rotational echo double resonance (REDOR) and transferred echo double resonance (TEDOR) nuclear magnetic resonance (NMR) experiments. Furthermore, the CP technique is still reliable under fast MAS where both REDOR and TEDOR sequences suffer from severe artefacts due to finite pulse lengths. In octadecasil, a spinning frequency of ∼14 kHz is shown to be necessary for an effective suppression of 19F–19F spin diffusion. The influences of experimental missettings and radiofrequency (RF) field inhomogeneity are taken into account." @default.
- W2012111343 created "2016-06-24" @default.
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- W2012111343 date "1999-05-01" @default.
- W2012111343 modified "2023-10-16" @default.
- W2012111343 title "distance determination in fluoride-containing octadecasil by Hartmann–Hahn cross-polarization under fast magic-angle spinning" @default.
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- W2012111343 doi "https://doi.org/10.1016/s0926-2040(98)00093-9" @default.
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