Crystal structure of the heptamolybdate(VI)(paramolybdate) ion, [Mo7O24]6–, in the ammonium and potassium tetrahydrate salts
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Abstract
The crystal structures of the isomorphous salts MI6[Mo7O24],4H2O (M = NH4 or K) have been refined by three-dimensional X-ray diffraction methods. Unit cell dimensions of these monoclinic compounds, space group P21/C with Z= 4, are, ammonium salt: a= 8·3934 ± 0·0008, b= 36·1703 ± 0·0045, c= 10·4715 ± 0·0011 Å, β= 115·958°± 0·008°; and potassium salt: a= 8·15 ± 0·02, b= 35·68 ± 0·1, c= 10·30 ± 0·02 Å, β= 115·2°± 02°.
By use of multiple Weissenberg patterns, 8197 intensity data (Mo-Kα radiation) for the ammonium compound and 2178 (Cu-Kα radiation) for the potassium compound were estimated visually and used to test and refine Lindqvist's proposed structure in the space group P21/c. Lindqvist's structure was confirmed and the full matrix least-squares isotropic refinement led to R 0·076 (ammonium) 0·120 (potassium), with direct unambiguous location of the cations and water molecules in the potassium compound.
Suggested Citation
Evans, H.T., Gatehouse, B.M., Leverett, P., 1975, Crystal structure of the heptamolybdate(VI)(paramolybdate) ion, [Mo7O24]6–, in the ammonium and potassium tetrahydrate salts: Journal of the Chemical Society, Dalton Transactions, no. 6, p. 505-514, https://doi.org/10.1039/DT9750000505.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Crystal structure of the heptamolybdate(VI)(paramolybdate) ion, [Mo7O24]6–, in the ammonium and potassium tetrahydrate salts |
| Series title | Journal of the Chemical Society, Dalton Transactions |
| DOI | 10.1039/DT9750000505 |
| Issue | 6 |
| Year Published | 1975 |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Description | 10 p. |
| First page | 505 |
| Last page | 514 |