On-surface synthesis of thin organic and organometallic films in a bottom-up fashion has become a promising approach for the development of new nanotechnologies. In this work we studied 5,11-dibromotetracene (C18H10Br2) as a prototypical case of rodlike polyaromatic molecules functionalized with two bromine atoms on the sides. The adsorption and temperature-stimulated transformations of dibromotetracene assemblies on Ag(110) have been investigated by a combination of synchrotron radiation X-ray photoemission spectroscopy (XPS), near-edge X-ray absorption spectroscopy (NEXAFS), scanning tunneling microscopy (STM), and density functional theory (DFT) calculations. Upon the contact with the Ag substrate, the Br-C bonds are promptly cleaved at room temperature, and Ag-coordinated protopolymers are formed along the [001] substrate direction. The organometallic dimers and trimers remain on the surface up to 523 K. The stabilization of the protopolymers is driven by the substrate anisotropy and weak interactions with nearby Br atoms. The short oligomers formed at elevated temperatures are weakly bounded to the substrate and desorb before covalent structures can be formed.

Píš, I., Ferrighi, L., Nguyen, T., Nappini, S., Vaghi, L., Basagni, A., et al. (2016). Surface-Confined Polymerization of Halogenated Polyacenes: The Case of Dibromotetracene on Ag(110). JOURNAL OF PHYSICAL CHEMISTRY. C, 120(9), 4909-4918 [10.1021/acs.jpcc.5b12047].

Surface-Confined Polymerization of Halogenated Polyacenes: The Case of Dibromotetracene on Ag(110)

FERRIGHI, LARA
Secondo
;
VAGHI, LUCA;PAPAGNI, ANTONIO;DI VALENTIN, CRISTIANA;
2016

Abstract

On-surface synthesis of thin organic and organometallic films in a bottom-up fashion has become a promising approach for the development of new nanotechnologies. In this work we studied 5,11-dibromotetracene (C18H10Br2) as a prototypical case of rodlike polyaromatic molecules functionalized with two bromine atoms on the sides. The adsorption and temperature-stimulated transformations of dibromotetracene assemblies on Ag(110) have been investigated by a combination of synchrotron radiation X-ray photoemission spectroscopy (XPS), near-edge X-ray absorption spectroscopy (NEXAFS), scanning tunneling microscopy (STM), and density functional theory (DFT) calculations. Upon the contact with the Ag substrate, the Br-C bonds are promptly cleaved at room temperature, and Ag-coordinated protopolymers are formed along the [001] substrate direction. The organometallic dimers and trimers remain on the surface up to 523 K. The stabilization of the protopolymers is driven by the substrate anisotropy and weak interactions with nearby Br atoms. The short oligomers formed at elevated temperatures are weakly bounded to the substrate and desorb before covalent structures can be formed.
Articolo in rivista - Articolo scientifico
Physical and Theoretical Chemistry; Electronic, Optical and Magnetic Materials; Surfaces, Coatings and Films; Energy (all)
English
4909
4918
10
Píš, I., Ferrighi, L., Nguyen, T., Nappini, S., Vaghi, L., Basagni, A., et al. (2016). Surface-Confined Polymerization of Halogenated Polyacenes: The Case of Dibromotetracene on Ag(110). JOURNAL OF PHYSICAL CHEMISTRY. C, 120(9), 4909-4918 [10.1021/acs.jpcc.5b12047].
Píš, I; Ferrighi, L; Nguyen, T; Nappini, S; Vaghi, L; Basagni, A; Magnano, E; Papagni, A; Sedona, F; DI VALENTIN, C; Agnoli, S; Bondino, F
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/150016
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