University of Oulu

Kook, M., Kuusik, I., Pärna, R., Käämbre, T., Kikas, A., Tõnisoo, A., Kahk, J. M., Kivimäki, A., Reisberg, L., & Kisand, V. (2022). Ion fragmentation study of [emmim][tfsi], [emim][otf] and [emim][dca] by vacuum ultraviolet light. International Journal of Mass Spectrometry, 471, 116732.

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

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Author: Kook, M.1; Kuusik, I.1; Pärna, R.1;
Organizations: 1Institute of Physics, University of Tartu, W. Ostwald 1, EE-50411, Tartu, Estonia
2Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, 90014, Oulu, Finland
3MAX IV Laboratory, Lund University, P.O. Box 118, 22100, Lund, Sweden
Format: article
Version: accepted version
Access: embargoed
Persistent link:
Language: English
Published: Elsevier, 2022
Publish Date: 2023-10-24


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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Series: International journal of mass spectrometry
ISSN: 1387-3806
ISSN-E: 1873-2798
ISSN-L: 1387-3806
Volume: 471
Article number: 116732
DOI: 10.1016/j.ijms.2021.116732
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: The authors gratefully acknowledge the financial support by the Estonian Research Council (IUT2-25, MOBTP145), Estonian Centre of Excellence in Research “Advanced materials and high-technology devices for sustainable energetics, sensorics and nanoelectronics” TK141 (2014-2020.4.01.15-0011), European Regional Development Fund (project “Developing new research services and research infrastructures at MAX IV synchrotron radiation source” (2014-2020.4.01.20-0278) and the University of Tartu ASTRA Project PER ASPERA financed by the European Regional Development Fund. The research leading to this result has been also supported by the project CALIPSOplus under the Grant Agreement 730872 from the EU Framework Programme for Research and Innovation HORIZON 2020.
Copyright information: © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license