Uranyl oxamate hydrates: hydrothermal synthesis, crystal structure, photophysical properties, and selective crystallization
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- 作者：Yubo Shu ; Weisheng Liu
- 刊名：SCIENCE CHINA Chemistry
- 出版年：2016
- 出版时间：June 2016
- 年：2016
- 卷：59
- 期：6
- 页码：740-745
- 全文大小：1,115 KB
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Chinese Library of Science
Chemistry - 出版者：Science China Press, co-published with Springer
- ISSN：1869-1870
- 卷排序：59
文摘
Presented here are two isostructural uranyl coordination polymers [UO2(EDO)(H2O)]·H2O (1) and [UO2(BDO)(H2O)]·2H2O (2) (EDO2-=ethylene-1,2-dioxamate; BDO2-=butylene-1,2-dioxamate) with identical stepwise zigzag chain structure and distinct interchain hydrogen bonding interaction, prepared from hydrothermal reaction of DEEDO or DEBDO (DEEDO=diethyl ethylene-1,2-dioxamate; DEBDO=diethyl butylene-1,2-dioxamate) with uranyl ions. The monomeric uranyl-based fluorescence emissions of compounds 1 and 2 are red-shifted by about 6 and 5 nm respectively, compared to that of uranyl nitrate hexahydrate. Compound 1 has stronger emission than compound 2, but both their emissions exhibit triple-exponential decay. The photophysics of uranyl oxalate trihydrate was also investigated for comparison. The selective crystallization of compound 1 in alkaline solution was applied to the sequestration of uranyl ions, showing a kinetic preference.Keywordsuraniumoxamatehydrothermal synthesisphotophysicsselective crystallization