Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 57: Electronic structure of surfaces: Spectroscopy, surface states II
O 57.3: Vortrag
Mittwoch, 14. März 2018, 11:15–11:30, MA 042
1,3-Di(methoxy)imidazolium ionic liquid mixtures investigated by angle-resolved X-ray photoelectron spectroscopy — •Bettina Heller1, Claudia Kolbeck1, Inga Niedermaier1, Sabine Dommer2, Jürgen Schatz2, Hans-Peter Steinrück2, and Florian Maier2 — 1Lehrstuhl für Physikalische Chemie II, FAU Erlangen-Nürnberg, Germany — 2Lehrstuhl für Organische Chemie I, FAU Erlangen- Nürnberg, Germany
Ionic liquids (ILs) - salts with melting points typically well below 100 °C and an extremely low vapour pressure - allow for applying surface science methods under UHV condition such as X-ray photoelectron spectroscopy (XPS). In this work, the functionalised IL 1,3-di(methoxy)imidazolium hexafluorophosphate ([(MeO)2Im][PF6])[1] and its mixtures with two non-functionalised 1,3-dialkylimidazolium ILs, namely 1-methyl-3-octylimidazolium bis[(trifluoromethyl)sulfonyl] imide ([C8C1Im][Tf2N]) and 1,3-diethylimidazolium hexafluorophoshate ([C2C2Im][PF6]), were investigated. We were using our Dual Analyser System for Surface Analysis (DASSA)[2] for simultaneous measurements in 0° (bulk sensitive) and 80° (surface sensitive) emission relative to the surface normal of the sample. Changes in the angle-resolved XP spectra directly reveal differences in surface and bulk composition of the mixtures, whereas pronounced differences in the electronic structure due to functionalisation are reflected in large chemical shifts.
[1] G. Laus et al., Z. Naturforschung 2007, 62b, 295-308.
[2] I. Niedermaier et al., Rev. Sci. Instrum. 2016, 87, 045105.