Regensburg 2010 – scientific programme

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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 59.87: Poster

Wednesday, March 24, 2010, 17:45–20:30, Poster B1

Coordination networks of the charge transfer compounds TTF and TCNQ on Pb(111) — •Mario Konschake, Isabel Fernandez-Torrente, Katharina Franke, and Jose Ignacio Pascual — Freie Universität Berlin, Berlin, Germany

The charge transfer complex TTF-TCNQ has recently attracted considerable interest due to its electronic and magnetic properties when adsorbed on a Au(111) surface [1]. Here, we use low-temperature scanning tunnelling microscopy and spectroscopy to investigate the influence of a different substrate, i.e. Pb(111), on the adsorption properties.

As individual components, TTF and TCNQ exhibit very distinct bonding properties with the substrate. TTF adsorbs with its molecular skeleton perpendicular to the surface, giving rise to domains of π-stacked molecular islands. TCNQ, on the other hand, remains in a flat adsorption configuration and leads to an intriguing network, which is stabilized by Pb adatoms and their coordination bonding to the lone-pair electrons of the cyano terminations.

The coadsorption of TTF-TCNQ gives rise to a variety of phases with or without lead adatoms. Indications of a negative charging of the TCNQ molecules can be found in those forming metal-organic coordination networks.

[1] I. Fernández-Torrente et al. PRL 101(21):217203, 2008