Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 45: Poster: Solid-Liquid Interfaces - Structure, Spectroscopy, Reactions and Electrochemistry
O 45.6: Poster
Dienstag, 13. März 2018, 18:15–20:30, Poster A
Dissolution of noble metals (Au, Ag, Cu) in a trihalide ionic liquid in oxidation state +1 as shown by XPS — •Benjamin May1, Matthias Lexow1, Hans-Peter Steinrück1, Florian Maier1, Nicola Taccardi2, Juergen Schatz3, and Harald Maid4 — 1Physikalische Chemie II, FAU Erlangen-Nürnberg, Erlangen, Germany — 2Chemische Reaktionstechnik, FAU Erlangen-Nürnberg, Erlangen, Germany — 3Organische Chemie I, FAU Erlangen-Nürnberg, Erlangen, Germany — 4Organische Chemie II, FAU Erlangen-Nürnberg, Erlangen, Germany
The corrosion of metals, particularly those generally considered inert, is important to many of the applications of trihalides. In this poster we present the results of X-ray photoelectron spectroscopy analysis of a trihalide ionic liquid, [C6C1Im][Br2I], and its reactions with the group 11 metals copper, silver, and gold. We find that all three of the metals are susceptible to corrosion by the IL. In addition, we find evidence that all three metals are dissolved in the +1 oxidation state. We propose a reaction of the general form:
M + [Br2I]− —→ M+ + 2Br− + I•,
with two iodine radicals recombining to form molecular iodine. Additional testing shows that this reaction occurs in both the presence and absence of water, and that the imidazolium C2 proton is not involved in the corrosion reaction.