Temperature-controlled metal/ligand stoichiometric ratio in Ag-TCNE coordination networks



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Rodríguez-Fernández, Jonathan and Lauwaet, Koen and Herranz, Maria Ángeles and Martín, Nazario and Gallego, José María and Miranda, Rodolfo and Otero, Roberto (2015) Temperature-controlled metal/ligand stoichiometric ratio in Ag-TCNE coordination networks. Journal of Chemical Physics, 142 . ISSN 0021-9606 (print),1089-7690 (online)

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Official URL: http://dx.doi.org/10.1063/1.4913326


The deposition of tetracyanoethylene (TCNE) on Ag(111), both at Room Temperature (RT, 300K) and low temperatures (150 K), leads to the formation of coordination networks involving silver adatoms, as revealed by Variable-Temperature Scanning Tunneling Microscopy (VT-STM). Our results indicate that TCNE molecules etch away material from the step edges and possibly also from the terraces, which facilitates the formation of the observed coordination networks. Moreover, such process is temperature dependent, which allows for different stoichiometric ratios between Ag and TCNE just by adjusting the deposition temperature. X-ray Photoelectron Spectroscopy (XPS) and Density Functional Theory (DFT) calculations reveal that charge-transfer from the surface to the molecule and the concomitant geometrical distortions at both sides of the organic/inorganic interface might facilitate the extraction of silver atoms from the step-edges and, thus, its incorporation into the observed TCNE coordination networks.

Item Type:Article
Uncontrolled Keywords:Charge transfer; Density functional theory; Deposition; Molecules; Polycrystalline materials; Scanning tunneling microscopy; Silver
Subjects:Sciences > Chemistry > Chemistry, Organic
ID Code:35973
Deposited On:26 Feb 2016 12:41
Last Modified:02 Mar 2016 12:29

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