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X-ray photoelectron spectroscopy of morpholinium ionic liquids: impact of a long alkyl side substituent on the cation-anion interactions

Men, Shuang; Sun, Yusheng; Licence, Peter; Qu, Jun

X-ray photoelectron spectroscopy of morpholinium ionic liquids: impact of a long alkyl side substituent on the cation-anion interactions Thumbnail


Authors

Shuang Men

Yusheng Sun

Jun Qu



Abstract

In this study, X-ray photoelectron spectroscopy is used to analyse nine morpholinium ionic liquids, which are of great interest in green chemistry because of their low toxicity and high recyclability. The effect of the alkyl chain length on the aliphatic C 1s binding energy and the impact of the anion basicity on the cationic N 1s and O 1s binding energies are investigated. It is concluded that by changing the basicity of the anion, there is a more notable change in the electronic environment of the oxygen centre. The impact of a long alkyl side substituent on the cation-anion interactions is also discussed. It is observed that there is an intense charge shielding effect of the alkyl side chain in the cases of octyl and dodecyl substituents, which is reflected in the reduced Br 3d5/2 binding energy.

Citation

Men, S., Sun, Y., Licence, P., & Qu, J. (2022). X-ray photoelectron spectroscopy of morpholinium ionic liquids: impact of a long alkyl side substituent on the cation-anion interactions. Physical Chemistry Chemical Physics, 24(40), 24845-24851. https://doi.org/10.1039/d2cp03674f

Journal Article Type Article
Acceptance Date Sep 15, 2022
Online Publication Date Sep 16, 2022
Publication Date Oct 28, 2022
Deposit Date Sep 29, 2022
Publicly Available Date Mar 29, 2024
Journal Physical Chemistry Chemical Physics
Print ISSN 1463-9076
Electronic ISSN 1463-9084
Publisher Royal Society of Chemistry (RSC)
Peer Reviewed Peer Reviewed
Volume 24
Issue 40
Pages 24845-24851
DOI https://doi.org/10.1039/d2cp03674f
Keywords Physical and Theoretical Chemistry; General Physics and Astronomy
Public URL https://nottingham-repository.worktribe.com/output/11752652
Publisher URL https://pubs.rsc.org/en/content/articlelanding/2022/cp/d2cp03674f

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