Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster: Surface Reactions
O 35.1: Poster
Dienstag, 19. März 2024, 18:00–20:00, Poster C
Surface Science Investigations of Oxanorbornadiene/ Oxaquadricyclane Ester Derivatives as MOST Systems on Pt(111) — •Felix Hemauer1, Valentin Schwaab1, Eva Marie Freiberger1, Natalie J. Waleska-Wellnhofer1, Daniel Krappmann1, Hans-Peter Steinrück1, and Christian Papp2 — 1Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany — 2Freie Universität Berlin, Germany
The harvesting and storage of solar power is feasible in a chemical manner with so-called molecular solar thermal (MOST) systems. In one-photon one-molecule processes, the conversion of the energy-lean norbornadiene (NBD) into its strained quadricyclane (QC) isomer takes place upon irradiation. On demand, the energy-releasing back reaction is triggered. For a sustainable storage and release cycle, the catalytic release needs to occur without loss of the MOST molecules. Since the methylene bridgehead group was found to be the weakest link, the surface chemistry of derivatized hetero-NBD/QC pairs was assessed on Pt(111). Specifically, synchrotron radiation-based XPS experiments were performed on 2,3 bis(methylester)-oxa-NBD/QC derivatives and its extended 2,3-bis(benzylester) substitution. Next to qualitative information on adsorption motifs, respective reaction pathways were deduced by means of temperature-programmed measurements. That is, the energy release in the cycloreversion reaction from the energy-rich isomers was studied, as well as competing desorption and decomposition steps determined. The DFG (392607742) supported this work. We thank HZB for allocation of synchrotron radiation beamtime.
Keywords: catalysis; energy storage; MOST system; norbornadiene; photoelectron spectroscopy