U3F12(H2O), a Noncentrosymmetric Uranium(IV) Fluoride Prepared via a Convenient In Situ Route That Creates U4+ under Mild Hydrothermal Conditions

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• 作者：Jeongho Yeon ; Mark D. Smith ; Athena S. Sefat ; T. Thao Tran ; P. Shiv Halasyamani ; Hans-Conrad zur Loye
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：August 5, 2013
• 年：2013
• 卷：52
• 期：15
• 页码：8303-8305
• 全文大小：205K
• 年卷期：v.52,no.15(August 5, 2013)
• ISSN：1520-510X

文摘

A new noncentrosymmetric U⁴⁺-containing fluoride, U₃F₁₂(H₂O), has been synthesized via a mild hydrothermal route and its crystal structure determined by single-crystal X-ray diffraction. The material exhibits a complex three-dimensional structure that is based on [U₆F₃₃(H₂O)₂)]^{9鈥?/sup> hexanuclear building units consisting of corner- and edge-shared UF₈, UF₉, and UOF₇ polyhedra. Powder second-harmonic generation (SHG) measurements revealed that the SHG efficiency for U₃F₁₂(H₂O) is comparable to that of 伪-SiO₂. Magnetic susceptibility measurements indicated that the U4+(f2)-containing material exhibits a singlet ground state at low temperature. IR and UV鈥搗is reflectance spectra were obtained, and the thermal behavior was investigated by thermogravimetric analysis.}