期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 120, 期 9, 页码 4909-4918出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b12047
关键词
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资金
- Italian MIUR [2012 RBFR128BEC]
- program Progetto premiale-Project ABNANOTECH-ATOM BASED NANOTECHNOLOGY
- CINECA supercomputing center through the computing IscrB_CMGEC4FC grant
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 diners 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.
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