Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.71: Poster
Mittwoch, 24. März 2010, 17:45–20:30, Poster B1
Electronic properties of metal-organic coordination bonding — •Christoph Limbach1, Robert Drost1, Nils Henningsen1, Riccardo Rurali2, Katharina J. Franke1, and Nacho Pascual1 — 1Freie Universität Berlin, Berlin, Germany — 2Institut de Ciència de Materiales de Barcelona (ICMAB), Barcelona, Spain
Metal organic networks are a promising system for tuning the electronic and magnetic properties of single metal atoms. Using low temperature scanning tunneling microscopy and spectroscopy (STM/STS) we investigate the coadsorption of di-metacyano azobenzene (DMC) molecules and cobalt atoms on a Au(111) surface leading to metal-organic chains. dI/dV spectroscopy and conductance maps plotting the distribution of unoccupied resonances are used to localize and characterize the coordination bonds between Co adatoms and DMC. We find that Co-molecule coordination bonds are formed distinguishably at different intramolecular sites, i.e. at the lone-pair electrons at the cyano termination and the di-azo bridge (-N=N-). Density functional theory simulations find a different degree of charge transfer and hybridization of the atomic and molecular orbitals for the two different sites, thus sustaining the experimental observations.