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- W2949976360 abstract "A pentavalent uranium germanate, Cs3UGe7O18, was synthesized under high-temperature, high-pressure hydrothermal conditions at 585 °C and 160 MPa and structurally characterized by single-crystal X-ray diffraction and infrared spectroscopy. The valence state of uranium was confirmed by X-ray photoelectron spectroscopy and electron paramagnetic resonance. The room-temperature EPR spectrum can be simulated with two components using an axial model that are consistent with two distinct sites of uranium(V). In the structure of the title compound, each [6]GeO6 octahedron is bonded to six three-membered single-ring [4]Ge3O96– units to form germanate triple layers in the ab plane. Each layer contains nine-ring windows; however, these windows are blocked by adjacent layers. The triple layers are further connected by UO6 octahedra to form a three-dimensional framework with intersecting six-ring channels along the ⟨11̅0⟩ directions. The Cs+ cation sites are fully occupied, ordered, and located in the cavities of the framework. Pentavalent uranium germanates or silicates are very rare, and only two uranium silicates and one germanate analogue have been published. However, all of them are iso-structural with those of the Nb or Ta analogues. In contrast, the title compound adopts a new structural type and contains both four- and six-coordinate germanium. Crystal data of Cs3UGe7O18: trigonal, P3̅c1 (No. 165), a = 12.5582(4) Å, c = 19.7870(6) Å, V = 2702.50(15) Å3, Z = 6, Dcalc = 5.283 g·cm–3, μ(Mo Kα) = 26.528 mm–1, R1 = 0.0204, wR2 = 0.0519 for 1958 reflections with I > 2σ(I). GooF = 1.040, ρmax,min = 1.018, and −1.823 e·Å–3." @default.
- W2949976360 created "2019-06-27" @default.
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- W2949976360 date "2012-03-05" @default.
- W2949976360 modified "2023-09-25" @default.
- W2949976360 title "Cs<sub>3</sub>UGe<sub>7</sub>O<sub>18</sub>: A Pentavalent Uranium Germanate Containing Four- and Six-Coordinate Germanium" @default.
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- W2949976360 doi "https://doi.org/10.1021/ic3000872" @default.
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