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WU Kai-ge, SHEN Xing-hai. Assembly of UO2(CMPO)3(NO3)2 and Mechanism of Uranyl Extraction by CMPO in Ionic Liquid[J]. Journal of Nuclear and Radiochemistry, 2021, 43(2): 136-141. DOI: 10.7538/hhx.2020.YX.2019057
Citation: WU Kai-ge, SHEN Xing-hai. Assembly of UO2(CMPO)3(NO3)2 and Mechanism of Uranyl Extraction by CMPO in Ionic Liquid[J]. Journal of Nuclear and Radiochemistry, 2021, 43(2): 136-141. DOI: 10.7538/hhx.2020.YX.2019057
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Assembly of UO2(CMPO)3(NO3)2 and Mechanism of Uranyl Extraction by CMPO in Ionic Liquid

  • Beijing National Laboratory for Molecular Sciences, Fundamental Science on Radiochemistry and Radiation Chemistry Laboratory, Center for Applied Physics and Technology, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China

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  • Ionic liquid can participate in or affect the self-assembly of amphiphiles due to its unique physical and chemical properties. Most amphiphiles used in the field of self-assembly based on ionic liquid are organic compounds, while the assembly of metal complexes in ionic liquid is rarely reported. In addition, the complex formed in the extraction of UO2+2 by octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide(CMPO)-1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide(C2mimNTf2) system needs further study. In this work, the self-assembly of UO2(CMPO)3(NO3)2 in C2mimNTf2 was studied. In situ transmission electron microscope(in situ TEM) demonstrats that UO2(CMPO)3(NO3)2 formed assembly in C2mimNTf2 in the presence of 70 μL water. Freeze-fracture transmission electron microscope(FF-TEM) shows that the assembly was micelle.In addition, the complex formed in the extraction of UO2+2 by CMPO-C2mimNTf2 system was studied. Ion chromatography shows that the concentration of NO-3 in water phase is almost unchanged before and after extraction. The peaks appeared in electrospray ionization mass spectrometry(ESI-MS) are attributed to the fragments of UO2(CMPO)3(NTf2)2. These results indicate that the extraction complex is UO2(CMPO)3(NTf2)2 instead of UO2(CMPO)3(NO3)2. This work helps understand the assembly of metal complexes in ionic liquid and provides an important insight into the extraction mechanism of UO2+2 by CMPO-C2mimNTf2 system.
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