Seymour, JM;
Gousseva, E;
Large, A;
Clarke, CJ;
Licence, P;
Fogarty, RM;
Duncan, DA;
... Lovelock, KRJ; + view all
(2021)
Experimental measurement and prediction of ionic liquid ionisation energies.
Physical Chemistry Chemical Physics
, 23
(37)
pp. 20957-20973.
10.1039/d1cp02441h.
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Abstract
Ionic liquid (IL) valence electronic structure provides key descriptors for understanding and predicting IL properties. The ionisation energies of 60 ILs are measured and the most readily ionised valence state of each IL (the highest occupied molecular orbital, HOMO) is identified using a combination of X-ray photoelectron spectroscopy (XPS) and synchrotron resonant XPS. A structurally diverse range of cations and anions were studied. The cation gave rise to the HOMO for nine of the 60 ILs presented here, meaning it is energetically more favourable to remove an electron from the cation than the anion. The influence of the cation on the anion electronic structure (and vice versa) were established; the electrostatic effects are well understood and demonstrated to be consistently predictable. We used this knowledge to make predictions of both ionisation energy and HOMO identity for a further 516 ILs, providing a very valuable dataset for benchmarking electronic structure calculations and enabling the development of models linking experimental valence electronic structure descriptors to other IL properties, e.g. electrochemical stability. Furthermore, we provide design rules for the prediction of the electronic structure of ILs.
| Type: | Article |
|---|---|
| Title: | Experimental measurement and prediction of ionic liquid ionisation energies |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1039/d1cp02441h |
| Publisher version: | https://doi.org/10.1039/D1CP02441H |
| Language: | English |
| Additional information: | This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10135981 |
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