Insight into the Uranyl Oxyfluoride Topologies through the Synthesis, Crystal Structure, and Evidence of a New Oxyfluoride Layer in [(UO2)4F13][Sr3(H2O)8](NO3)·H2O

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• 作者：Laurent J. Jouffret ; Jean-Michel Hiltbrunner ; Murielle Rivenet ; Nicolas Sergent ; Saïd Obbade ; Daniel Avignant ; Marc Dubois
• 刊名：Inorganic Chemistry
• 出版年：2016
• 出版时间：December 5, 2016
• 年：2016
• 卷：55
• 期：23
• 页码：12185-12192
• 全文大小：520K
• ISSN：1520-510X

文摘

A new strontium uranyl oxyfluoride, [(UO₂)₄F₁₃][Sr₃(H₂O)₈](NO₃)·H₂O, was synthesized under hydrothermal conditions. The single-crystal X-ray structure was determined. This compound crystallizes in the triclinic space group P1̅ (No. 2), with unit cell parameters a = 10.7925(16) Å, b = 10.9183(16) Å, c = 13.231(2) Å, α = 92.570(8)°, β = 109.147(8)°, γ = 92.778(8)°, V = 1468.1(4) ų, and Z = 2. The structure is built from uranyl-containing chains of tetrameric units of corner-sharing UO₂F₅ pentagonal bipyramids. These chains are linked through trimeric strontium units to form strontium–uranyl oxyfluoride layers further assembled by nitrate groups. The interlayer space is occupied by free water molecules. This compound was characterized by spectroscopic methods, especially ¹⁹F NMR highlighting the many different fluoride sites. Structural relationships with other uranyl oxyfluorides were investigated through the different F/O ratios, the structural building unit, and the structural arrangement.