Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 8: Surface Reactions
O 8.4: Vortrag
Montag, 18. März 2024, 11:15–11:30, MA 141
Real-Space Imaging of Surface Reactions: Deprotonation and Metalation of Phthalocyanine — •Andreas Christ, Matthias Bode, and Markus Leisegang — Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
On-surface reactions of phthalocyanines allow to drastically change the molecular properties as well as the interaction with a substrate. Several studies have demonstrated metalation process with both co-deposited atoms and by substrate atoms [1]. However, insights into the process related with metalation by means of direct observation on a single-molecule level have rarely been reported.
In our study, we investigate the temperature-driven self-metalation from H2Pc to CuPc on a Cu(111) surface by means of STM.
We find that the metalation process proceeds at a significantly higher temperature threshold
than previous reported [2] and that it competes with a deprotonation process.
All three molecule species, H2Pc, H0Pc, and CuPc, can unambiguously be identified by their distinct STM-induced rotational behavior.
This allows us to determine the species of each individual adsorbed molecule
and thus gain a detailed insight into the temperature dependence of both surface-induced reactions [3].
[1] J. M. Gottfried, Surf. Sci. Rep. 70, 259 (2015)
[2] M. Chen et al., J. Phys. Chem. C 118, 8501 (2014)
[3] A. Christ et al., Phys. Chem. Chem. Phys. 25, 7681 (2023)
Keywords: Self-metalation; Deprotonation; Phthalocyanine; Cu(111)