Mise en évidence d'un nouvel acide tungstique en solution. Filiations avec d'autres polytungstates
- 1 November 1977
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Chemistry
- Vol. 55 (21) , 3758-3762
- https://doi.org/10.1139/v77-530
Abstract
A new tungstic acid has been prepared in aqueous solutions by ion exchange. At room temperature gelation occurs in solutions in a few hours, and 3 or 4 days after, the yellow oxide WO3 precipitates. In aqueous solutions, this acid is formed by tetramers of W6O192− units, which give a gel after association. X-ray analyses of tungstic acid in the solid state demonstrate the absence of crystallinity. In hydroorganic medium, tungstic acid is stabilized in solution, but exists in equilibrium with the Y tungstic and hexatungstic (Fuchs) anions. The condensation of the Y acid and one of its reduced forms is discussed. The pure acid forms of hexatungstic (Fuchs) and Y ions are obtained in solutions and in the solid state.Keywords
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