Journal
CHINESE CHEMICAL LETTERS
Volume 31, Issue 3, Pages 801-804Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2019.05.028
Keywords
Magnetic ionic liquids; Temperature-dependent; Structure; Change; XAFS
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Funding
- National Natural Science Foundation of China [U1832152, 21802095, 11805261]
- Shanghai Sailing Program [19YF1458200]
- China Postdoctoral Science Foundation [2017M621468]
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The temperature-dependent structural changes in 1-butyl-3-methylimidazolium tetrafluoride ([Bmim]FeCl4) magnetic ionic liquid (MIL) were investigated by using in-situ X-ray absorption fine structure (XAFS) combined with Raman spectroscopy and DFT calculations. XAFS results revealed that the coordination number and bond length of Fe-Cl in the anion of [Bmim]FeCl4 MIL decreased with increments in temperature. These results directly reflected the dissociation of tetrahedral structure [FeCl4](-), and the formation of bridge-chain [Fe2Cl5](+), and [FeCl2](+) species in the anion of [Bmim]FeCl4 MIL. These behaviors indicated that [FeCl4](-) dissociation was endothermic, and was promoted by increased temperature. The results obtained through XAFS were in agreement with those obtained through Raman spectroscopy and DFT calculations. (C) 2019 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
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