資料載入中.....
|
請使用永久網址來引用或連結此文件:
https://ir.lib.ncu.edu.tw/handle/987654321/101863
|
| 題名: | Tubular Chains, Single Layers, and Multiple Chains in Uranyl Silicates: A2[(UO2)Si4O10] (A = Na, K, Rb, Cs) |
| 作者: | 李光華;Liu, Hsin-Kuan;Peng, Chun-Chi;Chang, Wen-Jung;Lii, Kwang-Hwa |
| 貢獻者: | 理學院化學學系 |
| 日期: | 2016-09-07 |
| 上傳時間: | 2026-04-21 14:48:42 (UTC+8) |
| 出版者: | American Chemical Society |
| 摘要: | 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 |
| 顯示於類別: | [化學學系] 期刊論文
|
文件中的檔案:
| 檔案 |
描述 |
大小 | 格式 | 瀏覽次數 |
|---|
| index.html | | 0Kb | HTML | 19 | 檢視/開啟 |
|
在NCUIR中所有的資料項目都受到原著作權保護.
|
