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Chemical endurance versus on-surface de-fluorination of C60F48 at room temperature

AuthorsPalacios Rivera, Rogger; Sauthier, Guillaume ; Barrena, Esther ; Ocal, Carmen
Issue Date2018
CitationInternational workshop On-Surface Synthesis (2018)
AbstractConversely to a non-reactive adsorption on Au(111), the chemical structure of fluorinated fullerene (C60F48) is strongly affected upon molecular deposition on Cu(111) at room temperature. The low deposition rates employed permit neglecting intermolecular interactions and point to an on-surface induced catalytic process where charge transfer with the copper substrate cannot be discarded. As plausible scenario we propose the rotation of the highly mobile molecules on the surface adopting successive adsorption configurations till losing their whole fluorine content. A throughout X-ray photoelectron spectroscopy (XPS) study demonstrates that the integrity of the individual C60F48 molecules is preserved, i.e. no decomposition occurs during molecule evaporation. The absence of traces of fluorine species on the cooper surface allows concluding that the observed de-fluorination reaction is accompanied by their leave to the gas phase. Scanning Tunneling Microscopy (STM) imaging of submonolayer deposits of de-fluorinated fullerenes further support this interpretation. In addition to a clear surface restructuration (Figure 1a), close-packed 2D islands with lattice unit cells dimensions corresponding to the well-known C60 packing are observed (Figure 1b). The molecular building blocks forming these islands exhibit all submolecular details expected from the fluorine-free Buckminsterfullerene units (Figure 1c). Only after large deposition times, for which the completely C60 covered Cu(111) surface is passivated, C60F48 molecules landing retain their pristine nature as indicated by XPS. Such integrity is also maintained upon adsorption on Au(111), supporting the endurance of the molecules on this surface.
DescriptionResumen del póster presentado al International workshop On-Surface Synthesis (OSS), celebrado en Sant Feliu de Guíxol (España) del 23 al 28 de septiembre de 2018.
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(CIN2) Comunicaciones congresos
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