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Thermal stability of dialkylimidazolium tetrafluoroborate and hexafluorophosphate ionic liquids: ex situ bulk heating to complement in situ mass spectrometry

Clarke, Coby James; Puttick, Simon; Sanderson, Thomas J.; Taylor, Alasdair; Bourne, Richard A.; Lovelock, Kevin R.J.; Licence, Peter

Authors

Coby James Clarke cobyjclarke@gmail.com

Simon Puttick

Thomas J. Sanderson

Alasdair Taylor Alasdair.taylor@nottingham.ac.uk

Richard A. Bourne

Kevin R.J. Lovelock



Abstract

Thermal decomposition (TD) products of the ionic liquids (ILs) [CnC1Im][BF4] and [CnC1Im][PF6] ([CnC1Im]+ = 1-alkyl-3-methylimidazolium, [BF4]- = tetrafluoroborate, and [PF6]- = hexafluorophosphate) were prepared, ex situ, by bulk heating experiments in a bespoke setup. The respective products, CnC1(C3N2H2)BF3 and CnC1(C3N2H2)PF5 (1-alkyl-3-methylimidazolium-2trifluoroborate and 1-alkyl-3-methylimidazolium-2-pentafluorophosphate), were then vaporized and analyzed by direct insertion mass spectrometry (DIMS) in order to identify their characteristic MS signals. During IL DIMS experiments we were subsequently able, in situ, to identify and monitor signals due to both IL vaporization and IL thermal decomposition. These decomposition products have not been observed in situ during previous analytical vaporization studies of similar ILs. The ex situ preparation of TD products is therefore perfectly complimentary to in situ thermal stability measurements. Experimental parameters such as sample surface area to volume ratios and heating rates are consequently very important for ILs that show competitive vaporization and thermal decomposition. We have explained these experimental factors in terms of Langmuir evaporation and Knudsen effusion-like conditions, allowing us to draw together observations from previous studies to make sense of the literature on IL thermal stability. Hence, the design of experimental setups are crucial and previously overlooked experimental factors.

Citation

Clarke, C. J., Puttick, S., Sanderson, T. J., Taylor, A., Bourne, R. A., Lovelock, K. R., & Licence, P. (in press). Thermal stability of dialkylimidazolium tetrafluoroborate and hexafluorophosphate ionic liquids: ex situ bulk heating to complement in situ mass spectrometry. Physical Chemistry Chemical Physics, 20(24), https://doi.org/10.1039/C8CP01090K

Journal Article Type Article
Acceptance Date May 31, 2018
Online Publication Date Jun 1, 2018
Deposit Date Jun 6, 2018
Publicly Available Date Jun 2, 2019
Journal Physical Chemistry Chemical Physics
Print ISSN 1463-9076
Electronic ISSN 1463-9084
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 20
Issue 24
DOI https://doi.org/10.1039/C8CP01090K
Public URL http://eprints.nottingham.ac.uk/id/eprint/52225
Publisher URL http://pubs.rsc.org/en/content/articlelanding/2018/cp/c8cp01090k#!divAbstract
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf

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PLicence Thermal Stability of Dialkylimidazolium.pdf (2.1 Mb)
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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf


PLicence Thermal Stability of Dialkylimidazolium.pdf (2.2 Mb)
PDF

Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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