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O: Fachverband Oberflächenphysik

O 8: Poster Session I: Solid-liquid interfaces: Structure, spectroscopy

O 8.3: Poster

Monday, March 1, 2021, 10:30–12:30, P

Stability and Exchange Processes in Ionic Liquid/Porphyrin Composite Films on Metal Surfaces — •Matthias Lexow, Stephen Massicot, Florian Maier, and Hans-Peter Steinrück — Lehrstuhl für Physikalische Chemie II, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen

In the context of organic-organic multicomponent heterostructures on metals, we studied prototypical composite systems of ultrathin porphyrin and ionic liquid (IL) films on metallic supports – Ag(111) and Au(111) – by means of angle-resolved X-ray photoelectron spectroscopy under well-defined ultrahigh vacuum conditions. After deposition of an IL on top of a monolayer of porphyrin, we observe changes in the growth behavior and thermal stability of the IL compared to deposition directly on the metals. Upon adsorption of a porphyrin layer on top of a frozen IL film at around 90 K, the porphyrin molecules replace the IL at the IL/metal interface upon heating above 240 K, a process likely driven by a larger adsorption energy of the porphyrin molecules on the Ag(111) and Au(111) surfaces.

Supported by the European Research Council (ERC) through an Advanced Investigator Grant to HPS (No. 693398-ILID).

Lexow et al., J. Phys. Chem. C, 2019, 123, 29708.