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- W2950500700 abstract "The reaction of tungstate ions with the γ-10-tungstosilicate in mixed water−ethanol (v/v) yields the corresponding isomer of the 12-tungstosilicate isolated as its tetrabutylammonium salt. It was characterized by means of 183W NMR, infrared, Raman, and UV spectroscopies and was identified with the isomer resulting from the Keggin structure (α-isomer) by rotation of two tritungstic groups by π/3. Cyclic voltammetry shows that the reducibility increases in the sequence α−β−γ as the number of rotated tritungstic groups. Whereas the γ-12-tungstosilicate anion is unstable in pure aqueous solution whatever the pH value, it is stable in mixed aqueous−organic or pure organic solvents, even at boiling temperatures. In contrast, the two- and four-electron-reduced blue species are stable in aqueous media but not the one-electron-reduced blue. Study of the 183W NMR spectrum of the two-electron-reduced species showed that the two spin-paired electrons are delocalized on all the W atoms on the NMR time scale but have a larger residency time on one group of four atoms." @default.
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- W2950500700 date "1996-01-01" @default.
- W2950500700 modified "2023-10-16" @default.
- W2950500700 title "Synthesis, Structural Characterization, and Oxidation−Reduction Behavior of the γ-Isomer of the Dodecatungstosilicate Anion" @default.
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- W2950500700 doi "https://doi.org/10.1021/ic951004l" @default.
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