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)]

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/100686

Title:	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)]
Authors:	李光華;Liu, Hsin-Kuang;Lii, Kwang-Hwa
Contributors:	理學院化學學系
Date:	2013-08-19
Issue Date:	2026-04-21 14:10:41 (UTC+8)
Publisher:	American Chemical Society
Abstract:	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
Appears in Collections:	[Department of Chemistry] journal & Dissertation

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