Dresden 2017 – scientific programme
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O: Fachverband Oberflächenphysik
O 106: Electronic Structure of Surfaces: Spectroscopy, Surface States III
O 106.1: Talk
Friday, March 24, 2017, 10:30–10:45, WIL C107
ARXPS investigations on surface composition and electronic structure of oxygen- and sulfur-functionalized ionic liquids — •Bettina Heller1, Claudia Kolbeck1, Inga Niedermaier1, Sabine Dommer2, Nicola Taccardi3, Jürgen Schatz2, Peter Wasserscheid3, Hans-Peter Steinrück1, and Florian Maier1 — 1Lehrstuhl für Physikalische Chemie II, FAU Erlangen-Nürnberg, Germany — 2Lehrstuhl für Organische Chemie I, FAU Erlangen-Nürnberg, Germany — 3Lehrstuhl für Chemische Reaktionstechnik, FAU Erlangen-Nürnberg, Germany
Angle-resolved X-ray photoelectron spectroscopy (ARXPS) is a powerful technique to investigate electronic and surface properties of ionic liquids (ILs).[1] This study focuses on sulfur- and oxygen-functionalized ILs, such as thioether and alkoxy ILs, which have the potential of forming carbene complexes used in e.g. catalysis.
With our new Dual Analyzer System for Surface Analysis (DASSA), we simultaneously record ARXPS measurements at 0° (bulk sensitive) and 80° emission (surface sensitive).[2] These spectra provide information on the electronic structure -by means of chemical shifts- and on surface orientation effects.
Imidazolium ILs with ether- and methoxy-sidechains have a random surface orientation in contrast to their non-functionalized ILs counterparts. Regarding the functionalization with sulfur as a thiouronium, a change in the electronic structure of the imidazolium ring is observed.
[1] H.-P. Steinrück, Phys. Chem. Chem. Phys. 2012, 14, 5010.
[2] I. Niedermaier et al., Rev. Sci. Instrum. 2016, 87, 045105.