Premium
Uranyl Phosphonates with Multiple Uranyl Coordination Geometries and Low Temperature Phase Transition
Author(s) -
Chen Lanhua,
Zhang Yugang,
Weng Zhehui,
Liu Zhiyong,
Zhang Jiarong,
Wang Yaxing,
Wang Shuao
Publication year - 2021
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.202000510
Subject(s) - uranyl , chemistry , tetragonal crystal system , crystallography , uranium , phosphonate , ion , crystal structure , hexagonal crystal system , single crystal , coordination number , powder diffraction , materials science , organic chemistry , metallurgy
Main observation and conclusion Two new uranium(VI) phosphonate compounds, namely K 8 [N(C 2 H 5 ) 4 ] 2 (UO 2 ) 17 (H 2 O) 4 [CH 2 (PO 3 ) 2 ] 8 [CH 2 (PO 3 )(PO 3 H)] 4 ‧16(H 2 O) (1) and [N(C 2 H 5 ) 4 ] 4 (H 3 O) 2 (UO 2 ) 10 [CH 2 (PO 3 ) 2 ] 5 [CH 2 (PO 3 )(PO 3 H)] 2 ‧10H 2 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 UO 6 tetragonal, UO 7 pentagonal, and UO 8 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.