Luiz S. Longo Jr
Study of the Stability of 1-Alkyl-3-methylimidazolium Hexafluoroantimonate(V) Based Ionic Liquids Using X-ray Photoelectron Spectroscopy
Longo Jr, Luiz S.; Smith, Emily F.; Licence, Peter
Abstract
A series of highly pure 1-alkyl-3-methylimidazolium hexafluoroantimonate (V) ionic liquids was firstly investigated by XPS. Reliable binding energy values for all elements within the samples were obtained by applying a C 1s fitting model previously employed for other imidazolium ionic liquids, based on setting the C 1s aliphatic component to 285.0 eV when alkyl chains are longer than 8 carbons. We also observed a straightforward X-ray-mediated photoreduction of Sb (V) to Sb (III) species, i.e. reduction of [SbF6]- anion to volatile SbF3. Thus, binding energies values observed at 542.5 eV and 533.1 eV were attributed to Sb 3d3/2 (V) and Sb 3d5/2 (V), respectively, whereas values at 541.0 eV and 531.7 eV were found for Sb 3d3/2 (III) and Sb 3d5/2 (III), respectively. The SbF3 being formed can be lost either by evaporation and/or redistribution to the bulk. Providing the sample is cooled to freezing temperatures, the SbF3 is prevented from escaping the ionic liquid and it accumulated on the surface of cooled [C4C1Im][SbF6] and [C8C1Im][SbF6]. Particularly in the case of prolonged X-ray exposure of a cooled [C4C1Im][SbF6], an unprecedented further reduction of Sb (III) to Sb (0) was noticed. This study provides fundamental knowledge on the XPS data for antimony compounds as well as providing a step towards the surface analysis of materials composed by antimony species, notably the hexafluoroantimonate (V) anion.
Citation
Longo Jr, L. S., Smith, E. F., & Licence, P. (2016). Study of the Stability of 1-Alkyl-3-methylimidazolium Hexafluoroantimonate(V) Based Ionic Liquids Using X-ray Photoelectron Spectroscopy. ACS Sustainable Chemistry and Engineering, 4(11), 5953-5962. https://doi.org/10.1021/acssuschemeng.6b00919
Journal Article Type | Article |
---|---|
Acceptance Date | Aug 9, 2016 |
Online Publication Date | Aug 19, 2016 |
Publication Date | Nov 7, 2016 |
Deposit Date | Aug 22, 2016 |
Publicly Available Date | Aug 22, 2016 |
Journal | ACS Sustainable Chemistry & Engineering |
Electronic ISSN | 2168-0485 |
Publisher | American Chemical Society |
Peer Reviewed | Peer Reviewed |
Volume | 4 |
Issue | 11 |
Pages | 5953-5962 |
DOI | https://doi.org/10.1021/acssuschemeng.6b00919 |
Public URL | https://nottingham-repository.worktribe.com/output/806174 |
Publisher URL | http://pubs.acs.org/doi/abs/10.1021/acssuschemeng.6b00919 |
Additional Information | This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Sustainable Chemistry and Engineering, copyright © American Chemical Society after peer review and technical editing by the publisher. |
Contract Date | Aug 22, 2016 |
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