Abstract
In melts of potassium monofluorophosphate and potassium fluoride the new compound K 2PO 3F.KF is formed at 850 °C. According to x-ray powder diffraction data this compound and K 2SO 4.KF [1] are isostructural. Only one mole fluoride per mole monofluorophosphate reacts. Solid-state high-resolution 19F NMR spectroscopy shows that different types of fluorine atoms exist in the investigated samples. In solid-state NMR spectra natural broadening due to strong direct dipolar F-F interactions masks the chemical shift and indirect spin-spin coupling. To overcome this obstacle we used the multipulse technique (four pulse cycle WHH 4 with γ = 4,1 μs). The shape of the resulting high-resolution 19F NMR spectra of polycrystalline samples is dominated by the F-P coupling tensor as well as the 19 F chemical shift tensor. On the basis of the tensor data it is possible to differentiate the covalent bonded fluorine atoms from the ionic bonded ones and to get new insights into the structure of the title compound.
Published Version
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