Self-metalation of a free-base porphyrin on a metal oxide surface mediated by extended defects: Insight from ab initio molecular dynamics simulations

2022-09-01
Malcıoğlu, Osman Barış
Bockstedte, Michel
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An important pathway for functionalization of porphyrin-based organic-inorganic structures is the metalation of porphyrins. Recently, the porphyrin metalation was demonstrated on different metal oxide surfaces, however, the underlying mechanisms regarding the role of the surface morphology, the substituted metal, and ligands are still under investigation. Here we address the adsorption and self-metalation of H2TPP on a MgO(001) surface with low-coordinated sites. We employ ab initio molecular dynamics simulations around room temperature to provide insight into dynamic steric effects. We observe that H2TPP is mobile on the pristine surface as the steric hindrance by phenyl rings prevents the physisorption of the macrocycle at a specific site. In contrast, step edges or kink sites provide anchor points exposing low-coordinated, reactive oxygen-sites to hydrogens of the macrocycle. We report a spontaneous proton transfer at these sites forming an intermediate complex before the metalation occurs. The energetics of the self-metalation reaction is modeled.
Porphyrins, Metalation, Metal oxide, Magnesiumoxide, Low-coordinated sites, Ab initio Molecular Dynamics, Electronic structure, LATTICE-DYNAMICS, TETRAPHENYLPORPHYRIN, ABSORPTION, MGO(100), SPECTRA, ATOMS, NIO, Ab initio Molecular Dynamics, Electronic structure, Low-coordinated sites, Magnesiumoxide, Metal oxide, Metalation, Porphyrins
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85129947296&origin=inward
https://hdl.handle.net/11511/101706
Surface Science
Department of Physics, Article

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Citation Formats
O. B. Malcıoğlu and M. Bockstedte, “Self-metalation of a free-base porphyrin on a metal oxide surface mediated by extended defects: Insight from ab initio molecular dynamics simulations,” Surface Science, vol. 723, pp. 0–0, 2022, Accessed: 00, 2023. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85129947296&origin=inward.
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