Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Inorganic/Organic Interfaces

O 41.13: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster B

Structural and electronic properties of metal-organic networks on Pb(111) — •Gelavizh Ahmadi and Katharina J. Franke — Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.

Metal-organic networks provide an interesting playground with flexible building blocks to explore different bonding structures, confinement of electronic states and magnetic properties. The latter are particularly interesting on superconducting substrates, where the competition of superconducting pairing and magnetic interactions can be detected with high energy resolution. Here we employ low-temperature scanning tunneling microscopy and spectroscopy to characterize the structure and electronic properties of metal-organic networks of the organic acceptor tetracyanonaptho-quinodimethane (TNAP) and metal atoms (Na, Pb). Adsorption of TNAP at 170 K leads to the formation of highly ordered hydrogen bonded islands. Annealing to room temperature results in a distinctly different arrangement, where four cyano-groups point towards each other. This bonding motif can only be explained by incorporation of Pb atoms into this windmill-like structure. Co-deposition of Na from NaCl leads to a rectangular structure, where the Na atoms are surrounded by four cyano-groups. This suggests the formation of an ionic bond by charge transfer of the 3s electron from Na to TNAP. However, we detect no sign of magnetic interaction with the underlying superconductor.