Structural analysis of [Bmim]2CuCl4 ionic liquids in the presence of water and ethanol by XAFS technique

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• 作者：Fangling Jiang (1) (2)
  Cheng Li (1)
  Haiying Fu (1)
  Yaxing Wang (1)
  Xiaojing Guo (1)
  Guozhong Wu (1)
  
  1. Shanghai Institute of Applied Physics ; Chinese Academy of Sciences ; Shanghai ; 201800 ; China
  2. Graduate University of Chinese Academy of Sciences ; Beijing ; 100049 ; China
  
• 关键词：ionic liquids ; water ; ethanol ; XAFS
• 刊名：SCIENCE CHINA Chemistry
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：58
• 期：4
• 页码：716-721
• 全文大小：938 KB
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• 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

文摘

The structure of [Bmim]2sub>CuCl4sub> ionic liquids (Bmim: 1-butyl-3-methylimidazolium) with different ratios of H2sub>O and C2sub>H5sub>OH was investigated using X-ray absorption fine structure (XAFS) technique. In this study, XAFS was employed to directly probe the conformational variations of copper ions in [Bmim]2sub>CuCl4sub> with the addition of either water or ethanol. XAFS analysis confirmed that the structure of ionic liquids gradually transformed from tetrahedral to octahedral configuration with the increase in ratio of H2sub>O. Our results also showed that water molecules coordinated with the copper ions of [Bmim]2sub>CuCl4sub>, leading to the conformational change in ionic liquids. However, the XAFS spectra of [Bmim]2sub>CuCl4sub>/C2sub>H5sub>OH indicated no coordination of anhydrous ethanol with the copper ions of [Bmim]2sub>CuCl4sub>. The structure of [Bmim]2sub>CuCl4sub> ionic liquids is maintained as the tetrahedral configuration in presence of ethanol. Therefore, anhydrous ethanol causes little variation in the structure of ionic liquids and it is a good solvent for the dilution of ionic liquids.