Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5396712 | Journal of Electron Spectroscopy and Related Phenomena | 2009 | 6 Pages |
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]+PF6â 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]+Tf2Nâ and [Cnmim]+OTfâ are contributed from the both cation and anion.
Keywords
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Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
K. Kanai, T. Nishi, T. Iwahashi, Y. Ouchi, K. Seki, Y. Harada, S. Shin,