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• W4320502519 endingPage "7687" @default.
• W4320502519 startingPage "7681" @default.
• W4320502519 abstract "Upon deposition on a surface, molecules can undergo a plethora of changes, such as reactions with adsorbates and surface atoms and catalytic decomposition. Since different reaction pathways may coexist, spatially averaging techniques can be insufficient for the characterization and distinction of all on-surface products. Here, we present a study of single phthalocyanine molecules on a Cu(111) surface which was performed using high-resolution low-temperature STM. Upon deposition of metal-free H2Pc, we can identify three distinct molecular species. A thorough investigation reveals that temperature-driven on-surface reactions partially convert H2Pc into H0Pc and CuPc. The individual species are differentiated by their topographic appearance and can unambiguously be identified by their STM-induced rotational behavior. While H2Pc shows a switching between two orientations at low energies, a third orientation can be observed above E > 800 meV, which is induced by tautomerization. Around the Fermi level, the rotational behavior is asymmetric, owing to the excitation of vibrational modes in unoccupied states whereas resonant tunneling occurs in occupied states. A two-step deprotonation of H2Pc confirms that the second species is H0Pc. By comparison with CuPc evaporated on Cu(111), we unambiguously reveal that the third species is indeed CuPc, which exhibits an exceptionally low threshold for rotational switching accompanied by an asymmetric behavior around the Fermi level. Varying the post-annealing temperature, we found a sharp threshold for the H2Pc → CuPc on-surface metalation at around 100 °C. In contrast, the competing process of thermal decomposition from H2Pc to H0Pc only increases weakly." @default.
• W4320502519 created "2023-02-14" @default.
• W4320502519 creator A5029192985 @default.
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• W4320502519 date "2023-01-01" @default.
• W4320502519 modified "2023-10-14" @default.
• W4320502519 title "Real-space resolved surface reactions: deprotonation and metalation of phthalocyanine" @default.
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• W4320502519 doi "https://doi.org/10.1039/d2cp05716f" @default.
• W4320502519 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36857662" @default.
• W4320502519 hasPublicationYear "2023" @default.
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