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- W1975930550 endingPage "11573" @default.
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- W1975930550 abstract "Vanadium environments in Keggin oxopolytungstates were characterized by (51)V solid-state MAS NMR spectroscopy. (C(4)H(9))(4)N(+)-, K(+)-, Cs(+)-, as well as mixed Na(+)/Cs(+)- salts of the mono-, di-, and trivanadium substituted oxotungstates, [VW(11)O(40)](4-), [V(2)W(10)O(40)](5-), and [V(3)W(9)O(40)](6-), have been prepared as microcrystalline and crystalline solids. Solid-state NMR spectra report on the local environment of the vanadium site in these Keggin ions via their anisotropic quadrupolar and chemical-shielding interactions. These (51)V fine structure constants in the solid state are determined by the number of vanadium atoms present in the oxoanion core. Surprisingly, the quadrupolar anisotropy tensors do not depend to any significant extent on the nature of the countercations. On the other hand, the chemical-shielding anisotropy tensors, as well as the isotropic chemical shifts, display large variations as a function of the cationic environment. This information can be used as a probe of the local cationic environment in the vanadium-substituted Keggin solids." @default.
- W1975930550 created "2016-06-24" @default.
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- W1975930550 date "2004-08-27" @default.
- W1975930550 modified "2023-09-27" @default.
- W1975930550 title "<sup>51</sup>V Magic Angle Spinning NMR Spectroscopy of Keggin Anions [PV<i><sub>n</sub></i>W<sub>12-</sub><i><sub>n</sub></i>O<sub>40</sub>]<sup>(3+</sup><sup><i>n</i></sup><sup>)-</sup>: Effect of Countercation and Vanadium Substitution on Fine Structure Constants" @default.
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- W1975930550 doi "https://doi.org/10.1021/ja0475499" @default.
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