High-temperature, high-pressure hydrothermal synthesis and characterization of a salt-inclusion mixed-valence uranium(V,VI) silicate: [Na9F 2][(UVO2)(UVIO2) 2(Si2O7)2]

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/100654

Title:	High-temperature, high-pressure hydrothermal synthesis and characterization of a salt-inclusion mixed-valence uranium(V,VI) silicate: [Na9F 2][(UVO2)(UVIO2) 2(Si2O7)2]
Authors:	李光華;Chang, Yu-Chih;Chang, Wen-Jung;Boudin, Sophie;Lii, Kwang-Hwa
Contributors:	理學院化學學系
Date:	2013-06-17
Issue Date:	2026-04-21 14:09:48 (UTC+8)
Publisher:	American Chemical Society;United States: American Chemical Society
Abstract:	摘要： A salt-inclusion mixed-valence uranium(V,VI) silicate, [Na9F2][(UVO2)(UVIO2)2(Si2O7)2], was synthesized under hydrothermal conditions at 585 °C and 160 MPa and structurally characterized by powder and single-crystal X-ray diffraction (XRD). The valence states of uranium were established by U 4f X-ray photoelectron spectroscopy (XPS). The structure contains two-dimensional (2D) sheets of uranyl disilicate with the composition [UO2Si2O7], which are connected by U(1)VO6 tetragonal bipyramids to form thick layers. The Na+ cations are located at sites in the intralayer and interlayer regions. In addition to Na+ cations, the interlayer region also contains F– anions such that infinite chains with the formula FNa1/1Na4/2 are formed. The same type of chain was observed in K2SnO3. The title compound is not only the first example of salt-inclusion metal silicate synthesized under high-temperature, high-pressure hydrothermal conditions, as well as the first salt-inclusion mixed-valence uranium silicate, but it is also the first mixed-valence uranium(V,VI) silicate in the literature. Crystal data: [Na9F2][(UVO2)(UVIO2)2(Si2O7)2], triclinic, P1̅ (No. 2), a = 5.789(1) Å, b = 7.423(2) Å, c = 12.092(2) Å, α = 90.75(3)°, β = 96.09(3)°, γ = 90.90(3)°, V = 516.5(2) Å3, Z = 1, R 1 = 0.0241, and wR 2 = 0.0612. 其他題名： Inorg. Chem 出版者： United States: American Chemical Society 出版日期： 2013-06-17 出處： Inorganic chemistry, 2013-06, Vol.52 (12), p.7230-7235 資源來源： American Chemical Society Journals 版權： Copyright © 2013 American Chemical Society 識別號： ISSN: 0020-1669 識別號： EISSN: 1520-510X 識別號： DOI: 10.1021/ic400854j 識別號： PMID: 23725593
Appears in Collections:	[Department of Chemistry] journal & Dissertation

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