Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 9: Poster: Interfaces and Thin Films (joint session with DECHEMA and VDI)

CPP 9.8: Poster

Montag, 11. März 2013, 17:30–19:30, Poster C

Synthesis and ARXPS Investigations of Nitrile-Functionalized Ionic Liquid Systems — •Sandra Krick Calderón¹, Inga Niedermaier¹, Nicola Taccardi², Florian Maier¹, Peter Wasserscheid², Peter Licence³, and Hans-Peter Steinrück¹ — ¹Physikalische Chemie II — ²Chemische Reaktionstechnik, Egerlandstr. 3, 91058 Erlangen — ³School of Chemistry, Nottingham NG7 2RD

Due to their outstanding physicochemical properties, ionic liquids (ILs) are promising candidates for many catalytic applications. One remaining challenge is the dissolution of transition metal complex (TMC) catalysts in ILs. Groups such as nitriles facilitate the interaction between IL and TMC up to direct IL-TMC complex formation. Two new nitrile-functionalized ILs ([(C₄CN)MIM][OTf] and [(C₄CN)₂IM][OTf]) were successfully synthesized. Additionally, two palladium-based nitrile-coordinated complexes [((C₄CN)MIM₂PdCl₂][OTf]₂ and [-(C₄CN)-IM(C₄CN)-PdCl₂-]_x[OTf]_x were prepared from these ILs. Angle-resolved X-ray photoelectron spectroscopy (ARXPS) revealed a sandwich-like structure for [(C₄CN)MIM][OTf] at the IL/vacuum interface, with the anion enriched in the outermost layer and the cation located below. Contrary, [(C₄CN)₂IM][OTf] shows a uniform distribution at the surface. In both cases, the CF₃ moiety of the [OTf⁻] anion is pointing towards vacuum. Quantitative analysis of the XPS data of both metal-IL-complexes show a loss in anion which leads to the assumption that a carbene complex is formed. Supported by the DFG through SPP 1191 and by the EAM Cluster of Excellence.