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Temperature-dependent electronic and vibrational structure of the 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide room-temperature ionic liquid surface: a study with XPS, UPS, MIES, and HREELS.

Krischok, S; Eremtchenko, M; Himmerlich, M; Lorenz, P; Uhlig, Jens LU ; Neumann, A; Ottking, R; Beenken, Wichard LU ; Höfft, O and Bahr, S, et al. (2007) In The Journal of Physical Chemistry Part B 111(18). p.6-4801
Abstract
The near-surface structure of the room-temperature ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide has been investigated as a function of temperature between 100 and 620 K. We used a combination of photoelectron spectroscopies (XPS and UPS), metastable induced electron spectroscopy (MIES), and high-resolution electron energy loss spectroscopy (HREELS). The valence band and HREELS spectra are interpreted on the basis of density functional theory (DFT) calculations. At room temperature, the most pronounced structures in the HREELS, UPS, and MIES spectra are related to the CF3 group in the anion. Spectral changes observed at 100 K are interpreted as a change of the molecular orientation at the outermost surface,... (More)
The near-surface structure of the room-temperature ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide has been investigated as a function of temperature between 100 and 620 K. We used a combination of photoelectron spectroscopies (XPS and UPS), metastable induced electron spectroscopy (MIES), and high-resolution electron energy loss spectroscopy (HREELS). The valence band and HREELS spectra are interpreted on the basis of density functional theory (DFT) calculations. At room temperature, the most pronounced structures in the HREELS, UPS, and MIES spectra are related to the CF3 group in the anion. Spectral changes observed at 100 K are interpreted as a change of the molecular orientation at the outermost surface, when the temperature is lowered. At elevated temperatures, early volatilization, starting at 350 K, is observed under reduced pressure. (Less)
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type
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publication status
published
keywords
Electron,Electron Energy-Loss,Electron Energy-Loss: methods,Electron: methods,Electrons,Imidazoles,Imidazoles: chemistry,Ionic Liquids,Ionic Liquids: chemistry,Microscopy,Sensitivity and Specificity,Spectrophotometry,Spectrophotometry: methods,Spectroscopy,Sulfonamides,Sulfonamides: chemistry,Surface Properties,Temperature,Vibration,X-Rays
in
The Journal of Physical Chemistry Part B
volume
111
issue
18
pages
6 - 4801
publisher
The American Chemical Society
external identifiers
  • scopus:34249723111
ISSN
1520-6106
DOI
10.1021/jp067136p
language
English
LU publication?
no
id
aed6c930-1bf4-40ec-96b0-3c24cdf7a426
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/17474703
date added to LUP
2016-04-14 06:16:00
date last changed
2017-10-01 05:17:59
@article{aed6c930-1bf4-40ec-96b0-3c24cdf7a426,
  abstract     = {The near-surface structure of the room-temperature ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide has been investigated as a function of temperature between 100 and 620 K. We used a combination of photoelectron spectroscopies (XPS and UPS), metastable induced electron spectroscopy (MIES), and high-resolution electron energy loss spectroscopy (HREELS). The valence band and HREELS spectra are interpreted on the basis of density functional theory (DFT) calculations. At room temperature, the most pronounced structures in the HREELS, UPS, and MIES spectra are related to the CF3 group in the anion. Spectral changes observed at 100 K are interpreted as a change of the molecular orientation at the outermost surface, when the temperature is lowered. At elevated temperatures, early volatilization, starting at 350 K, is observed under reduced pressure.},
  author       = {Krischok, S and Eremtchenko, M and Himmerlich, M and Lorenz, P and Uhlig, Jens and Neumann, A and Ottking, R and Beenken, Wichard and Höfft, O and Bahr, S and Kempter, V and Schaefer, J A},
  issn         = {1520-6106},
  keyword      = {Electron,Electron Energy-Loss,Electron Energy-Loss: methods,Electron: methods,Electrons,Imidazoles,Imidazoles: chemistry,Ionic Liquids,Ionic Liquids: chemistry,Microscopy,Sensitivity and Specificity,Spectrophotometry,Spectrophotometry: methods,Spectroscopy,Sulfonamides,Sulfonamides: chemistry,Surface Properties,Temperature,Vibration,X-Rays},
  language     = {eng},
  number       = {18},
  pages        = {6--4801},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {Temperature-dependent electronic and vibrational structure of the 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide room-temperature ionic liquid surface: a study with XPS, UPS, MIES, and HREELS.},
  url          = {http://dx.doi.org/10.1021/jp067136p},
  volume       = {111},
  year         = {2007},
}