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An x-ray diffraction study of the dehydration of 12-silicotungstic and 12-phosphomolybdic acids

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Bulletin of the Academy of Sciences of the USSR, Division of chemical science Aims and scope

Summary

  1. 1.

    The mechanism of dehydration and the structure of hydrates with a differing degree of dehydration of 12-silicotungstic and 12-phosphotungstic acids are the same. The mechanism of dehydration of 12-phosphomoiybdic acid differs from that of 12-phospho- and 12-silicotungstic acids. The valence state of molybdenum in 12-phosphomolybdic acid does not affect the structure of the 12-phosphomolybdat anion in crystals of the composition H3PMo12O40 · 29H2O or the structure of hydrates with a differing degree of dehydration.

  2. 2.

    The formation of a plateau on the dehydration curves of 12-phosphotungstic and 12-silicotungstic abids may be due to the selective layer removal of water in each cluster of 29 water molecules.

  3. 3.

    When 12-phosphotungstic and 12-silicotungstic acids are heated at temperatures of 700–900° and 400–850° isomorphic compounds are formed with a tetragonal lattice.

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Literature cited

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Authors and Affiliations

  1. Institute of Physical Chemistry, Academy of Sciences, USSR

    A. A. Babad-Zakhryapin

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  1. A. A. Babad-Zakhryapin
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Babad-Zakhryapin, A.A. An x-ray diffraction study of the dehydration of 12-silicotungstic and 12-phosphomolybdic acids. Russ Chem Bull 12, 197–200 (1963). https://doi.org/10.1007/BF00846381

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  • DOI: https://doi.org/10.1007/BF00846381

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