CRYSTAL CHEMISTRY OF URANYL MOLYBDATES. IV. THE STRUCTURES OF M2[(UO2)6(MO04)7(H2O)2] (M=CS, NH4
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dc.contributor.author | Krivovichev S.V. | |
dc.contributor.author | Burns P.C. | |
dc.date.accessioned | 2021-02-24T00:33:23Z | |
dc.date.available | 2021-02-24T00:33:23Z | |
dc.date.issued | 2001 | |
dc.identifier | https://elibrary.ru/item.asp?id=13380539 | |
dc.identifier.citation | The Canadian Mineralogist, 2001, 39, 1, 207-214 | |
dc.identifier.issn | 0008-4476 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/25515 | |
dc.description.abstract | Two new uranyl molybdate hydrates, occur as transparent yellow needles and yellow elongate plates for M = Cs and NH4, respectively. Their structures were solved by direct methods and refined on the basis of F2 for all unique data collected with MoKα X-radiation and a CCD (charge-coupled device) detector. Final R1 values are 4.1 and 3.9% for M = Cs and M = NH4, respectively, calculated for 2178 and 2969 unique observed (/F0/ ≤ 4σF) reflections, respectively. The compound Cs2[(UO2)6(MoO4)7(H2O)2] is orthorhombic, space group Pbcm, a 13.990(2), b 10.808(1), c 25.671(3) Å, V3881.6(9) Å3, Z = 4. The compound (NH4)2[(UO2)6(MoO4)7(H2O)2] is isostructural with the Cs analogue, a 13.970(1), b 10.747(1), c 25.607(2) Å, V 3844.4(6) Å3, Z = 4. The four symmetrically independent U6+ cations in M2[(UO2)6(MoO4)7(H2O)2] are part of approximately linear (UO2)2+ uranyl ions (Ur) that are further coordinated by five ligands at the equatorial positions of uranyl pentagonal bipyramids that are capped by OUr atoms. The four symmetrically identical Mo6+ cations are tetrahedrally coordinated by O atoms. The uranyl and molybdate polyhedra link by vertex sharing to form a framework, with the low-valence M cations located in voids within the framework. | |
dc.title | CRYSTAL CHEMISTRY OF URANYL MOLYBDATES. IV. THE STRUCTURES OF M2[(UO2)6(MO04)7(H2O)2] (M=CS, NH4 | |
dc.type | Статья |
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