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Ion fragmentation study of [EMMIM][TFSI], [EMIM][OTf] and [EMIM][DCA] by vacuum ultraviolet light

Kook, M. ; Kuusik, I. ; Pärna, R. ; Käämbre, T. ; Kikas, A. ; Tõnisoo, A. ; Kahk, J. M. ; Kivimäki, A. LU ; Reisberg, L. and Kisand, V. (2022) In International Journal of Mass Spectrometry 471.
Abstract

The ionic liquids (ILs) 1-Ethyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide [EMMIM][TFSI], 1-Ethyl-3-methylimidazolium trifluoromethanesulfonate [EMIM][OTf] and 1-Ethyl-3-methylimidazolium dicyanamide [EMIM][DCA] were evaporated by effusion and a time-of-flight (TOF) instrument was employed as the mass analyzer while vacuum ultraviolet (VUV) light in the energy range 9–20 eV was used to excite the IL molecules. Fragmentation patterns with respect to excitation energy are discussed and decomposition products are analyzed. Hydrogenated and dehydrogenated fragments are discussed. Our experiment seems to show that the ionic liquids with larger anions have less cation fragmentation. [EMMIM][TFSI] was studied for the first time... (More)

The ionic liquids (ILs) 1-Ethyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide [EMMIM][TFSI], 1-Ethyl-3-methylimidazolium trifluoromethanesulfonate [EMIM][OTf] and 1-Ethyl-3-methylimidazolium dicyanamide [EMIM][DCA] were evaporated by effusion and a time-of-flight (TOF) instrument was employed as the mass analyzer while vacuum ultraviolet (VUV) light in the energy range 9–20 eV was used to excite the IL molecules. Fragmentation patterns with respect to excitation energy are discussed and decomposition products are analyzed. Hydrogenated and dehydrogenated fragments are discussed. Our experiment seems to show that the ionic liquids with larger anions have less cation fragmentation. [EMMIM][TFSI] was studied for the first time and it produces different fragments than 1-Ethyl-3-methylimidazolium based ionic liquids. Surprisingly 1-Ethyl-3-methylimidazolium or 1-Ethyl-2-methylimidazolium cations were not detected in the [EMMIM][TFSI] fragmentation pattern.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ionic liquids, Time-of-flight mass spectrometry, [EMIM][DCA], [EMIM][OTf], [EMMIM][TFSI]
in
International Journal of Mass Spectrometry
volume
471
article number
116732
publisher
Elsevier
external identifiers
  • scopus:85117816252
ISSN
1387-3806
DOI
10.1016/j.ijms.2021.116732
language
English
LU publication?
yes
additional info
Publisher Copyright: © 2021
id
683aeb6b-d028-40b3-ae4f-fcdd651a7957
date added to LUP
2021-11-12 12:56:15
date last changed
2022-04-19 17:44:39
@article{683aeb6b-d028-40b3-ae4f-fcdd651a7957,
  abstract     = {{<p>The ionic liquids (ILs) 1-Ethyl-2,3-dimethylimidazolium bis(trifluoromethylsulfonyl)imide [EMMIM][TFSI], 1-Ethyl-3-methylimidazolium trifluoromethanesulfonate [EMIM][OTf] and 1-Ethyl-3-methylimidazolium dicyanamide [EMIM][DCA] were evaporated by effusion and a time-of-flight (TOF) instrument was employed as the mass analyzer while vacuum ultraviolet (VUV) light in the energy range 9–20 eV was used to excite the IL molecules. Fragmentation patterns with respect to excitation energy are discussed and decomposition products are analyzed. Hydrogenated and dehydrogenated fragments are discussed. Our experiment seems to show that the ionic liquids with larger anions have less cation fragmentation. [EMMIM][TFSI] was studied for the first time and it produces different fragments than 1-Ethyl-3-methylimidazolium based ionic liquids. Surprisingly 1-Ethyl-3-methylimidazolium or 1-Ethyl-2-methylimidazolium cations were not detected in the [EMMIM][TFSI] fragmentation pattern.</p>}},
  author       = {{Kook, M. and Kuusik, I. and Pärna, R. and Käämbre, T. and Kikas, A. and Tõnisoo, A. and Kahk, J. M. and Kivimäki, A. and Reisberg, L. and Kisand, V.}},
  issn         = {{1387-3806}},
  keywords     = {{Ionic liquids; Time-of-flight mass spectrometry; [EMIM][DCA]; [EMIM][OTf]; [EMMIM][TFSI]}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{International Journal of Mass Spectrometry}},
  title        = {{Ion fragmentation study of [EMMIM][TFSI], [EMIM][OTf] and [EMIM][DCA] by vacuum ultraviolet light}},
  url          = {{http://dx.doi.org/10.1016/j.ijms.2021.116732}},
  doi          = {{10.1016/j.ijms.2021.116732}},
  volume       = {{471}},
  year         = {{2022}},
}