Spectroscopic Analysis of 1-Butyl-3-methylimidazolium Ionic Liquids: Selection of the Charge Reference and the Electronic Environment
Abstract
Seven 1-butyl-3-methylimidazolium ionic liquids are analyzed by X-ray photoelectron spectroscopy. A reliable fitting model is developed for the C 1 s region. The electronic environment of nitrogen and sulfur atoms is demonstrated. The selection of the internal charge reference is discussed in detail. It is found that when the Kamlet-Taft hydrogen bond acceptor ability value of the anion is larger than 0.75, the aliphatic carbon component can be used as a reliable reference; otherwise, in other cases, F 1 s peak is applicable for the charge correction.
- Publication:
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Russian Journal of Physical Chemistry A
- Pub Date:
- October 2018
- DOI:
- 10.1134/S0036024418100308
- Bibcode:
- 2018RJPCA..92.1975S
- Keywords:
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- X-ray photoelectron spectroscopy;
- ILs;
- charge correction