X-ray Photoelectron Spectroscopy of 1-Butyl-2,3-Dimethylimidazolium Ionic Liquids: Charge Correction Methods and Electronic Environment of the Anion
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In this study, six 1-butyl-2,3-dimethylimidazolium ionic liquids are analyzed by X-ray photoelectron spectroscopy. A reliable fitting model is developed for the C 1s region. The charge correction method is discussed in detail. It suggests that the aliphatic carbon component can be used as an internal reference only if the Kamlet-Taft hydrogen bond acceptor ability value is larger than 0.57. The electronic environment of each anion-based component is compared to that of 1-butyl-3-methylimidazolium ionic liquids. It is found that noticeable binding energy shift can be observed in the spectra of S 2p for [TfO]– and P 2p for [PF6]–.
Keywords:X-ray photoelectron spectroscopy ionic liquids charge correction
The authors thank Liaoning Provincial Foundation of Science and Technology (20180550482) for financial support.
- 1.E. F. Smith, I. J. Villar-Garcia, D. Briggs, and P. Licence, Chem. Commun., No. 45, 5633 (2005).Google Scholar
- 5.D. Briggs and J. T. Grant, Surface Analysis by Auger and X-ray Photoelectron Spectroscopy (IM Publ., Manchester, 2003).Google Scholar
- 13.A. W. Taylor, F. L. Qiu, I. J. Villar-Garcia, and P. Licence, Chem. Commun., No. 39, 5817 (2009).Google Scholar