Cs 3UGe 7O 18: A pentavalent uranium germanate containing four- and six-coordinate germanium

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/100242

Title:	Cs 3UGe 7O 18: A pentavalent uranium germanate containing four- and six-coordinate germanium
Authors:	李光華;Nguyen, Quang Bac;Chen, Chun-Liang;Chiang, Yun-Wei;Lii, Kwang-Hwa
Contributors:	理學院化學學系
Date:	2012-03-19
Issue Date:	2026-04-21 13:55:00 (UTC+8)
Publisher:	American Chemical Society;United States: American Chemical Society
Abstract:	摘要： 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]Ge3O9 6– 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, D calc = 5.283 g·cm–3, μ(Mo Kα) = 26.528 mm–1, R 1 = 0.0204, wR 2 = 0.0519 for 1958 reflections with I > 2σ(I). GooF = 1.040, ρmax,min = 1.018, and −1.823 e·Å–3. 其他題名： Inorg. Chem 出版者： United States: American Chemical Society 出版日期： 2012-03-19 出處： Inorganic chemistry, 2012-03, Vol.51 (6), p.3879-3882 資源來源： American Chemical Society Journals 版權： Copyright © 2012 American Chemical Society 版權： 2012 American Chemical Society 識別號： ISSN: 0020-1669 識別號： ISSN: 1520-510X 識別號： EISSN: 1520-510X 識別號： DOI: 10.1021/ic3000872 識別號： PMID: 22390822
Appears in Collections:	[Department of Chemistry] journal & Dissertation

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