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

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: Sep 17, 2023
• Journal: Physical Chemistry Chemical Physics
• Print ISSN: 1463-9076
• Electronic ISSN: 1463-9084
• Publisher: Royal Society of Chemistry
• 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