| 离子液体中UO2(CMPO)3(NO3)2的组装及CMPO萃取铀的机理 |
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| 引用本文： | 吴凯阁,沈兴海.离子液体中UO2(CMPO)3(NO3)2的组装及CMPO萃取铀的机理[J].核化学与放射化学,2021(2):136-141,I0002. |
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| 作者姓名： | 吴凯阁 沈兴海 |
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| 作者单位： | 北京分子科学国家研究中心 |
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| 基金项目： | 科学挑战计划项目(TZ2016004);国家自然科学基金项目(U1830202)。 |
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| 摘 要： | 离子液体具有独特的物理化学性质,可以参与或影响两亲分子自组装。离子液体介质中的自组装研究所涉及的两亲分子多为有机化合物,而金属配合物在离子液体中的组装鲜有报道。另外,萃取剂正辛基苯基-N,N-二异丁基胺基甲酰基甲基氧化膦(CMPO)在1-乙基-3-甲基咪唑双三氟甲基磺酰亚胺盐(C2mimNTf2)中萃取UO2+2时形成的萃合物结构组成有待深入研究。本工作探究了UO2(CMPO)3(NO3)2在C2mimNTf2中的组装行为。原位透射电镜(原位TEM)研究表明:UO2(CMPO)3(NO3)2在C2mimNTf2(含70μL水)中形成聚集体,冷冻刻蚀电镜(FF-TEM)显示该聚集体是胶束。此外,研究了CMPO-C2mimNTf2体系萃取UO2+2时形成的萃合物组成。离子色谱结果表明:萃取前后水相中NO-3浓度变化不大,电喷雾质谱(ESI-MS)上均为UO2(CMPO)3(NTf2)2的碎片离子峰,这些结果说明:CMPO-C2mimNTf2体系萃取UO2+2时形成的萃合物组成为UO2(CMPO)3(NTf2)2而非UO2(CMPO)3(NO3)2。这有助于深入了解金属配合物在离子液体中的组装行为,并对理解CMPO-C2mimNTf2体系萃取UO2+2的机理提供了重要参考。
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| 关 键 词： | UO2+2 CMPO 离子液体 胶束 超分子组装 |
Assembly of UO2(CMPO)3(NO3)2and Mechanism of Uranyl Extraction by CMPO in Ionic Liquid |
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| WU Kai-ge,SHEN Xing-hai.Assembly of UO2(CMPO)3(NO3)2and Mechanism of Uranyl Extraction by CMPO in Ionic Liquid[J].Journal of Nuclear and Radiochemistry,2021(2):136-141,I0002. |
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| Authors: | WU Kai-ge SHEN Xing-hai |
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| Affiliation: | (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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| Abstract: | 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+2by 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)2in C2mimNTf2was studied.In situ transmission electron microscope(in situ TEM)demonstrats that UO2(CMPO)3(NO3)2formed assembly in C2mimNTf2in the presence of 70μL water.Freeze-fracture transmission electron microscope(FF-TEM)shows that the assembly was micelle.In addition,the complex formed in the extraction of UO2+2by CMPO-C2mimNTf2system 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)2instead 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+2by CMPO-C2mimNTf2system. |
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| Keywords: | UO2+2 CMPO ionic liquid micelle supramolecular assembly |
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