Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 15: Organic Molecules on Inorganic Substrates II: Mainly Porphyrins
O 15.6: Talk
Monday, March 16, 2020, 16:30–16:45, REC C 213
Thermal stability and conformational changes of a catalytically active metal/organic interface — •H. Sturmeit1, I. Cojocariu2,6, A. Cossaro3, A. Verdini3, L. Floreano3, C. Africh3, A. Sala3,4, G. Comelli3,4, S. Moro4, M. Stredansky3,4, M. Corva3,4, E. Vesselli3,4, M. Jugovac2, P. Puschnig5, C. M. Schneider2,6, V. Feyer2,6, G. Zamborlini1, and M. Cinchetti1 — 1TU Dortmund, Germany — 2Forschungszentrum Jülich, Germany — 3CNR-IOM, Lab. TASC, Italy — 4Physics Department, University of Trieste, Italy — 5Institut für Physik, Karl-Franzens-Universität Graz, Austria — 6Fakultät für Physik and CENIDE, Universität Duisburg-Essen, Germany
Porphyrin molecules are widely employed as building blocks in photovoltaics, heterogeneous catalysis, gas sensing and the emerging field of on-surface magnetochemistry. When deposited on metal electrodes, they can undergo surface-induced chemical changes, such as partial dehydrogenation, dehydrocyclization or intramolecular structural modifications of their macrocycle. These changes alter their electronic structure and thus their reaction properties essentially. We demonstrate the high thermal stability of catalytically active Ni(I)TPP up to 350∘C on a Cu electrode. Photoelectron tomography supported by photoemission and vibronic spectroscopy, and STM measurements prove that, below the fragmentation temperature, the adsorbed porphyrins do not experience any chemical modification, but undergo a conformational modification, while preserving the stability of the reactive Ni(I) ion. This is crucial for the re-activation of saturated catalytical sites.