Abstract
Ionic liquids—low temperature molten salts composed entirely of mobile ions—are a fascinating class of materials that have experienced an incredible growth in research over recent years. This is because of their immense applications in not only academic but also industrial processes. Ultra high vacuum technique, i.e. X-ray photoelectron spectroscopy is now accepted as a reliable method for the study of ionic liquid-based systems. To date, the main focus of research effort employing X-ray photoelectron spectroscopy has been upon imidazoliumbased ionic liquids, quite simply because these are the materials most often employed by synthetic chemists. However, X-ray photoelectron spectroscopy data (fitting models) for other than 1, 3-dialkyimidazolium based ionic liquids are required and need to be developed. 1, 10-Phenanthrolinium based ionic liquids are among the new compounds reported recently. However, no attempt is observed to investigate the electronic environments of its component atoms. In this report, therefore, the electronic environments of six N-alkyl-1, 10-Phenathrolinium based ionic liquids, [CnPhen][Tf2N] (n=1, 2, 4, 6, 8, 10), were investigated using the X-ray photoelectron spectroscopy and a good fitting is developed for C 1s, and N 1s that applies to each of the compounds studied. This model allows accurate charge correction and the determination of reliable and reproducible binding energies of all the atoms for each compound studied. Hence, this model could be taken as benchmark in investigating any compound containing 1, 10-phenanthroline derivatives.Keywords: 1, 10-phenanthroline, fitting model, Ionic liquids, X-ray photoelectron spectroscopy
Highlights
Ionic liquids (ILs) are low temperature melting salts composed solely of mobile ions
The main focus of research effort, in the area of surface characterization and ultra-high vacuum (UHV) characterization of ILs, has been upon imidazolium-based ionic liquids, quite because these are the materials most often employed by synthetic chemists (Men et al, 2011)
We report the investigation of the electronic environment of the component atoms of the N-alkyl-1, 10-phenanthrolinium cations, [Cnphen]+ n = 1, 2, 4, 6, 8. 10, and the anion, bis(trifluoromethylsulfonyl) imide, [CF3SO2]2N- (See Table 1) using ultra-high vacuum (UHV) characterization using x-ray photoelectron spectroscopy, XPS
Summary
Ionic liquids (ILs) are low temperature (below 100 °C) melting salts composed solely of mobile ions. The main focus of research effort, in the area of surface characterization and ultra-high vacuum (UHV) characterization of ILs, has been upon imidazolium-based ionic liquids, quite because these are the materials most often employed by synthetic chemists (Men et al, 2011). This class of ionic liquids have limitations such as poor solubility of simple metal salts. The binding energy data of the component atoms that again illustrate the information about their electronic environment of each atom of every element in the compound is extracted This can be used to probe the magnitude of cation-anion based interactions. This method of charge correction is valid because each of the samples in this homologous experimental series has a structurally similar cation and an identical anion, [Tf2N]-
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