Dresden 2017 – scientific programme
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O: Fachverband Oberflächenphysik
O 90: Surface Dynamics: Experiments
O 90.4: Talk
Thursday, March 23, 2017, 11:15–11:30, WIL C107
Surface Phase Behavior of [PPh4][Tf2N] / Cs[Tf2N]- and [PPh4][Tf2N] / Ni[Tf2N]2 Low-Temperature Molten Salt Mixtures — Patrick Schreiber1, Marlene Scheuermeyer2, •Radha G. Bhuin1, Peter Wasserscheid2, Hans-Peter Steinrück1, and Florian Maier1 — 1Lehrstuhl für Physikalische Chemie II, FAU, Erlangen, Germany — 2Lehrstuhl für Chemische Reaktionstechnik, FAU, Erlangen, Germany
We report on surface investigations using a new class of organic/inorganic molten salt mixtures based on a [PPh4][Tf2N] compound. Depending on composition, these mixtures combine low melting points with exceptionally high thermal stability, and thus, exhibit considerably enlarged reaction windows compared to conventional ionic liquids.[1] To elucidate their surface behavior, temperature-dependent angle-resolved XPS investigations were performed using our unique spectrometer DASSA (Dual Analyzer System for Surface Analysis).[2] The DASSA comprises an UHV chamber equipped with two electron analyzers for simultaneous electron detection at 0° and 80°. We follow temperature-induced changes in bulk and surface composition for mixtures of [PPh4][Tf2N]/Cs[Tf2N] and [PPh4][Tf2N]/Ni[Tf2N]2. Interestingly, the Cs-containing mixture in the liquid state favors the presence of [Cs]+ at the surface on expense of the bulky [PPh4]+ ions. RGB and HPS thank the ERC for financial support through an Advanced Investigator Grant to HPS. References: [1] Scheuermeyer et al., New J. Chem., 40, 7157, 2016. [2] Niedermaier et al., Rev. Sci. Instrum., 87, 045105, 2016.