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题名:
Extraction of local coordination structure in a low-concentration uranyl system by XANES
作者: Zhang, LJ; Zhou, J; Zhang, JY; Su, J; Zhang, S; Chen, N; Jia, YP; Li, J; Wang, Y; Wang, JQ
刊名: JOURNAL OF SYNCHROTRON RADIATION
出版日期: 2016
卷号: 23, 期号:-, 页码:758—768
关键词: X-RAY-ABSORPTION ; NEAR-EDGE STRUCTURE ; FINE-STRUCTURE ; AQUEOUS-SOLUTION ; ELECTRONIC-STRUCTURE ; IONIC LIQUIDS ; K-XANES ; SPECTROSCOPY ; URANIUM ; SPECTRA
DOI: 10.1107/S1600577516001910
通讯作者: Zhang, LJ ; Wang, JQ (reprint author), Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.
文章类型: 期刊文献
英文摘要: Obtaining structural information of uranyl species at an atomic/molecular scale is a critical step to control and predict their physical and chemical properties. To obtain such information, experimental and theoretical L-3-edge X-ray absorption near-edge structure (XANES) spectra of uranium were studied systematically for uranyl complexes. It was demonstrated that the bond lengths (R) in the uranyl species and relative energy positions (Delta E) of the XANES were determined as follows: Delta E-1 = 168.3/R(U-O-ax)(2) - 38.5 (for the axial plane) and Delta E-2 = 428.4/R(U-O-eq)(2) - 37.1 (for the equatorial plane). These formulae could be used to directly extract the distances between the uranium absorber and oxygen ligand atoms in the axial and equatorial planes of uranyl ions based on the U L-3-edge XANES experimental data. In addition, the relative weights were estimated for each configuration derived from the water molecule and nitrate ligand based on the obtained average equatorial coordination bond lengths in a series of uranyl nitrate complexes with progressively varied nitrate concentrations. Results obtained from XANES analysis were identical to that from extended X-ray absorption fine-structure (EXAFS) analysis. XANES analysis is applicable to ubiquitous uranyl-ligand complexes, such as the uranylcarbonate complex. Most importantly, the XANES research method could be extended to low-concentration uranyl systems, as indicated by the results of the uranyl-amidoximate complex (similar to 40 p.p.m. uranium). Quantitative XANES analysis, a reliable and straightforward method, provides a simplified approach applied to the structural chemistry of actinides.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000375146200015
ISSN号: 1600-5775
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.sinap.ac.cn/handle/331007/25723
Appears in Collections:中科院上海应用物理研究所2011-2017年_期刊论文

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Recommended Citation:
Zhang, LJ,Zhou, J,Zhang, JY,et al. Extraction of local coordination structure in a low-concentration uranyl system by XANES[J]. JOURNAL OF SYNCHROTRON RADIATION,2016-01-01,23(-):758—768.
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