| 1. |
Crystal structures of the cerium molybdenum and uranium molybdenum heteropoly acids have been determined for the first time.
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| 2. |
A short distance between oxygen atoms of two neighboring polyanions has been found, which allows the suggestion of the presence of a hydrogen bond between them.
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| 3. |
Distribution of the water molecules in the crystals of the acids is statistical.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 803–807, April, 1982.
The authors thank V. E. Zavodnik and V. K. Bel''skii for carrying out the diffractometric experiment.