Uranyl Phosphonates with Multiple Uranyl Coordination Geometries and Low Temperature Phase Transition

• 作者: Lanhua Chen Yugang Zhang Zhehui Weng Zhiyong Liu Jiarong Zhang Yaxing Wang Shuao Wang
• 来源期刊: 中国化学（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: Concise Reports
• 页码范围: 597-604
• 页数: 8页
• 语种: 英文
• DOI: 10.1002/cjoc.202000510

摘要

Two new uranium(Ⅵ) phosphonate compounds,namely K8[N(C2H5)4]2(UO2)17(H2O)4[CH2(PO3)2]8[CH2(PO3)(PO3H)]4·16(H2O) (1) and[N(C2H5)4]4(H3O)2(UO2)10[CH2(PO3)2]5[CH2(PO3)(PO3H)]2·10H2O (2),have been synthesized under mild hydro/solvothermal condition.The structural analysis of the two compounds reveals that they both contain all three typical coordination geometries of the U(Ⅵ) ions,including UO6 tetragonal,UO7 pentagonal,and UO8 hexagonal bipyramids.Moreover,compound 1 displays a temperature-induced single crystal to single crystal phase transformation as confirmed by the Single-crystal X-ray diffraction data collected at different temperatures.Temperature-dependent fluorescence spectra presented herein illustrate the perturbation of the electronic structure of uranyl centers.