Temperature-dependent structural changes of[Bmim]FeCl4 magnetic ionic liquid characterized by an in-situ X-ray absorption fine structure |
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| Authors: | Fangling Jiang Hao Peng Cheng Li Haiying Fu Guozhong Wu |
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| Institution: | Shanghai Jiao Tong University, Institute of Fuel Cells, Shanghai 200240, China; Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China |
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| Abstract: | 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 DFTcalculations. XAFS results revealed that the coordination number and bond length of Fe-Cl in the anion ofBmim]FeCl4 MIL decreased with increments in temperature. These results directly reflected the dissociation of tetrahedral structureFeCl4]-, and the formation of bridge-chainFe2Cl5]+, andFeCl2]+ species in the anion ofBmim]FeCl4 MIL. These behaviors indicated thatFeCl4]- 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. |
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| Keywords: | Magnetic ionic liquids Temperature-dependent Structure Change XAFS |
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