Tubular Chains, Single Layers, and Multiple Chains in Uranyl Silicates: A2[(UO2)Si4O10] (A = Na, K, Rb, Cs)

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101863

Title:	Tubular Chains, Single Layers, and Multiple Chains in Uranyl Silicates: A2[(UO2)Si4O10] (A = Na, K, Rb, Cs)
Authors:	李光華;Liu, Hsin-Kuan;Peng, Chun-Chi;Chang, Wen-Jung;Lii, Kwang-Hwa
Contributors:	理學院化學學系
Date:	2016-09-07
Issue Date:	2026-04-21 14:48:42 (UTC+8)
Publisher:	American Chemical Society
Abstract:	摘要： Four new uranyl silicates with the same framework composition but different crystal structures, Na2[(UO2)Si4O10]·0.5H2O (1), K2[(UO2)Si4O10] (2), Rb2[(UO2)Si4O10] (3), and Cs2[(UO2)Si4O10] (4), have been synthesized under supercritical hydrothermal conditions at 590 °C and 1620 bar and characterized by single-crystal X-ray diffraction and infrared and photoluminescence spectroscopy. Crystal data for compound 1: tetragonal, I4/mcm (No. 140), a = 18.0332(7) Å, c = 7.7752(5) Å, V = 2528.5(2) Å3, Z = 8, R 1 = 0.0447; compound 2: monoclinic, P21/n (No. 14), a = 8.2970(17) Å, b = 7.7403(15) Å, c = 8.7906(18) Å, β = 104.83(3)°, V = 545.74(19) Å3, Z = 2, R 1 = 0.0140; compound 3: monoclinic, P21/c (No. 14), a = 10.3483(3) Å, b = 23.7297(6) Å, c = 7.6278(2) Å, β = 110.482(1)°, V = 1754.68(8) Å3, Z = 6, R 1 = 0.0194; compound 4: orthorhombic, Cmca (No. 64), a = 7.7157(3) Å, b = 19.8719(8) Å, c = 24.0160(10) Å, V = 3682.3(3) Å3, Z = 12, R 1 = 0.0277. The silicate anions in the structures of these compounds form tubular chains, single layers, and multiple chains which are linked by UO6 tetragonal bipyramids to form three-dimensional frameworks. The tubular chains and single layers are of the new type with respect to the sequence of vertex orientations. The multiple chain is observed for the first time and contains Q 2, Q 3, and Q 4 Si. The structures of these silicate anions can be correlated with the sizes of alkali metal cations. 其他題名： Cryst. Growth Des 出版者： American Chemical Society 出版日期： 2016-09-07 出處： Crystal growth & design, 2016-09, Vol.16 (9), p.5268-5272 資源來源： American Chemical Society Journals 版權： Copyright © 2016 American Chemical Society 識別號： ISSN: 1528-7483 識別號： EISSN: 1528-7505 識別號： DOI: 10.1021/acs.cgd.6b00817
Appears in Collections:	[Department of Chemistry] journal & Dissertation

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