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| 題名: | Mixed-valence uranium(V,VI) and uranyl oxyhydroxides synthesized under high-temperature, high-pressure hydrothermal conditions: Na5[U 5O16(OH)2] and Na5[U 5O17(OH)] |
| 作者: | 李光華;Liu, Hsin-Kuang;Lii, Kwang-Hwa |
| 貢獻者: | 理學院化學學系 |
| 日期: | 2013-08-19 |
| 上傳時間: | 2026-04-21 14:10:41 (UTC+8) |
| 出版者: | American Chemical Society |
| 摘要: | 摘要： An unusaul mixed-valence uranium(V,VI) oxyhydroxide, Na5[U5O16(OH)2], was synthesized via reduction of UO2(2+) with zinc under hydrothermal conditions at 570 °C and 150 MPa. Its structure consists of extended sheets of edge-sharing U(VI) pentagonal bipyramids and U(V) square bipyramids. The overall anion topology is the same as that of the uranyl mineral sayrite, but the squares are populated by U(V)(OH)2(3+) ions. The valence state of uranium was confirmed by X-ray photoelectron spectroscopy. A hydrothermal reaction without zinc under the same reaction conditions yielded a uranyl oxyhydroxide, Na5[U5O17(OH)], with a new sheet structure. The sheet anion topology, which is closely related to that of the mixed-valence compound, contains chains of edge-sharing pentagons as well as dimers of corner-sharing squares.An unusaul mixed-valence uranium(V,VI) oxyhydroxide, Na5[U5O16(OH)2], was synthesized via reduction of UO2(2+) with zinc under hydrothermal conditions at 570 °C and 150 MPa. Its structure consists of extended sheets of edge-sharing U(VI) pentagonal bipyramids and U(V) square bipyramids. The overall anion topology is the same as that of the uranyl mineral sayrite, but the squares are populated by U(V)(OH)2(3+) ions. The valence state of uranium was confirmed by X-ray photoelectron spectroscopy. A hydrothermal reaction without zinc under the same reaction conditions yielded a uranyl oxyhydroxide, Na5[U5O17(OH)], with a new sheet structure. The sheet anion topology, which is closely related to that of the mixed-valence compound, contains chains of edge-sharing pentagons as well as dimers of corner-sharing squares.
出版日期： 2013-08-19
出處： Inorganic chemistry, 2013-08, Vol.52 (16), p.9172
資源來源： American Chemical Society Journals
識別號： ISSN: 1520-510X
識別號： EISSN: 1520-510X
識別號： DOI: 10.1021/ic401690s |
| 顯示於類別: | [化學學系] 期刊論文
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