Uranyl Phosphonates with Multiple Uranyl Coordination Geometries and Low Temperature Phase Transition. Issue 3 (8th February 2021)

• Record Type: Journal Article
• Authors: Chen, Lanhua; Zhang, Yugang; Weng, Zhehui; Liu, Zhiyong; Zhang, Jiarong; Wang, Yaxing; Wang, Shuao
• Is Part Of: Chinese journal of chemistry. Volume 39:Issue 3(2021)
• Page Start: 597
• Page End: 604
• Publication Date: 2021-02-08
• Subjects: Uranium(VI) Phosphonate compounds -- Multiple coordination geometries -- Low temperature phase transition -- Coordination chemistry -- Fluorescence spectroscopy; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/cjoc.202000510
• Languages: English
• ISSNs: 1001-604X

Abstract

Main observation and conclusion: Two new uranium(VI) phosphonate compounds, namely K8 [N(C2 H5 )4 ]2 (UO2 )17 (H2 O)4 [CH2 (PO3 )2 ]8 [CH2 (PO3 )(PO3 H)]4 ‧16(H2 O) (1) and [N(C2 H5 )4 ]4 (H3 O)2 (UO2 )10 [CH2 (PO3 )2 ]5 [CH2 (PO3 )(PO3 H)]2 ‧10H2 O (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. Abstract :