Dresden 2014 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 3: Ionic Liquids
CPP 3.8: Talk
Monday, March 31, 2014, 11:45–12:00, ZEU 260
Orientation at Liquid Surfaces: XPS Studies on Functionalised and Reactive Ionic Liquids — •Inga Niedermaier1, Claudia Kolbeck1, Alexey Deyko1, Nicola Taccardi2, Wei Wei2, Peter Wasserscheid2, Hans-Peter Steinrück1, and Florian Maier1 — 1FAU Erlangen, Phys. Chemie II — 2FAU Erlangen, Chem. Reaktionstechnik, Egerlandstr. 3, 91058 Erlangen
Ionic liquids (ILs) are molten salts with a melting point below 100 ∘C. Their extremely low vapour pressure allows using UHV-based surface science methods such as X-ray photoelectron spectroscopy (XPS). The liquid-vacuum interface of non-functionalised ILs with long alkyl chains has been studied thoroughly in the past.[1-2] At the surface, they generally exhibit a preferred orientation of their nonpolar alkyl moieties towards vacuum. Herein, we now present a detailed surface study of ILs carrying ether, thioether, amine and halogen functional groups. In addition, imidazolium based ILs methylated at the C(2) position are considered. From the angle-resolved XP spectra of all core levels, detailed information on surface enrichment of the functional groups and the arrangement of the ionic headgroups is derived. Furthermore, in-situ XPS of a reactive IL mixture[3] enables monitoring changes in surface segregation and orientation during course of the reaction.
Supported by the Cluster of Excellence - Engineering of Advanced Materials and DFG grant Ste 620/9-1.
[1] C. Kolbeck et al., J. Phys. Chem. B, 2009, 113, 8682-8688.
[2] K. R. J. Lovelock et al., J. Phys. Chem. B, 2009, 113, 2854-2864.
[3] C. Kolbeck et al., Angew. Chem. Int. Edit., 2012, 51, 2610-2613.