Electronic structures of imidazolium-based ionic liquids |
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| Authors: | K Kanai T Nishi T Iwahashi Y Ouchi K Seki Y Harada S Shin |
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| Institution: | aResearch Center of Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan;bGraduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan;cRIKEN/SPring-8, Sayo-gun, Hyogo 679-5148, Japan;dThe Institute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, Japan |
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| Abstract: | Electronic structures of ionic liquids formed by 1-buthyl-3-alkylimidazolium ion Cnmim]+ (n = 4 and 8) with various inorganic and organic anions have been investigated by ultraviolet photoemission, X-ray photoemission, inverse photoemission and soft X-ray emission spectroscopies (SXES). The comparison of the calculated density of states with the observed spectra revealed that the molecular orbital energies of these ionic liquids are significantly affected by the electrostatic Madelung potential among the ions. The SXES results clearly show that the both highest occupied and lowest unoccupied states of C4mim]+PF6− are derived from the cation as a result of strong Madelung potential. On the other hand, the SXES results show the valence electronic structures of ionic liquids with larger anion molecules, Cnmim]+Tf2N− and Cnmim]+OTf− are contributed from the both cation and anion. |
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| Keywords: | Ionic liquid Soft X-ray emission spectroscopy Electronic structure Photoemission spectroscopy Inverse photoemission spectroscopy |
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