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- W2108369989 abstract "Mit Hilfe der hochauflösenden 31P-Festkörper-NMR wurden mit hoher Genauigkeit die isotrope chemische Verschiebung, die Abschirmanisotropie und der Asymmetrieparameter der PO4-End- und Mittelgruppen der drei kristallinen Pentanatrium-catena-triphosphate Na5P3I10-I, Na5P3O10-II und Na5P3O10 · 6 H2O bestimmt. Obwohl die Struktur der P3O105−-Anionen dieser drei Kristallphasen nur wenig verschieden ist, ergaben sich signifikante Unterschiede in den genannten NMR-Parametern. Auf der Grundlage einer halbquantitativen Theorie zur 31P-chemischen Verschiebung von Phosphaten erfolgt eine Deutung der Unterschiede der isotropen chemischen Verschiebung der PO4-End- und Mittelgruppen, die sich von der Interpretation unterscheidet, die Andrew u. Mitarb. [3] gegeben haben. Es wird gezeigt, daß sich diese Differenz in den isotropen chemischen Verschiebungen auf Unterschiede der Elektronegativität der terminalen und brückengebundenen Sauerstoffatome der PO4-Gruppen zurückführen läßt. High-resolution Solid-state 31P NMR at 109.3 MHz of Penta-sodium Catena-triphosphates, Na5P3O10-I, Na5P3O10-II, and Na5P3O10 · 6 H2O Using high-resolution solid-state 31P n.m.r. exact values of the isotropic chemical shift, the chemical shift anisotropy, and the asymmetry parameter of the PO4 units (end and middle groups) of the three penta-sodium catena-triphosphates Na5P3O10-I, Na5P3O10-II, and Na5P3O10 · 6 H2O have been determined. Although the geometries of the P3O105− anions of the three polycrystalline phases are not very different, the afore-mentioned NMR parameters show significant differences for each PO4 tetrahedron. Starting from a semi-quantitative theory of the 31P chemical shift of phosphates the differences between the isotropic chemical shifts of the end and middle groups are rationalized in terms of differences of the electronegativities of the terminal and bridging oxygens. This interpretation differs from that given by Andrew et al. [3]." @default.
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- W2108369989 title "Hochaufl�sende31P-Festk�rper-NMR bei 109,3 MHz an den Pentanatrium-catena-triphosphaten Na5P3O10-I, Na5P3O10-II und Na5P3O10 � 6 H2O" @default.
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- W2108369989 doi "https://doi.org/10.1002/zaac.19865320122" @default.
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