Occurence of an Octanuclear Motif of Uranyl Isophthalate with Cation鈥揅ation Interactions through Edge-Sharing Connection Mode

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• 作者：Ionut Mihalcea ; Natacha Henry ; Nicolas Clavier ; Nicolas Dacheux ; Thierry Loiseau
• 刊名：Inorganic Chemistry
• 出版年：2011
• 出版时间：July 4, 2011
• 年：2011
• 卷：50
• 期：13
• 页码：6243-6249
• 全文大小：990K
• 年卷期：v.50,no.13(July 4, 2011)
• ISSN：1520-510X

文摘

An uranyl isophthalate has been hydrothermally synthesized at 200 掳C for 24 h, from a mixture of uranyl nitrate, isophthalic acid, and hydrazine in water. It was characterized by single-crystal analysis [triclinic, P1̅, a = 7.3934(3) 脜, b = 13.3296(5) 脜, c = 15.4432(5) 脜, 伪 = 111.865(2)掳, 尾 = 90.637(2)掳, 纬 = 104.867(2)掳, V = 1355.49(9) 脜³] and different spectroscopic techniques (Raman, IR-ATR, UV鈥搗isible). The 3D structure of the phase (UO₂)₈O₂(OH)₄(H₂O)₄(1,3-bdc)₄路4H₂O (1,3-bdc = 1,3-benzenedicarboxylate) reveals octanuclear units based on the association of 7-fold coordinated uranyl cations (pentagonal bipyramid) involving a rare case of cation鈥揷ation interaction together with edge-sharing polyhedral connection mode. UV鈥搗isible absorption spectroscopy confirmed that uranium was only involved in the structure as uranyl forms (excluding the presence of tetravalent or pentavalent uranium). Additionally, 渭-Raman and IR-ATR experiments allowed assigning four uranyl contributions to the four types of uranyl entities in the structure, in agreement with the XRD analysis.