Dresden 2009 – scientific programme

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O: Fachverband Oberflächenphysik

O 14: Organic, polymeric, biomolecular films – also with absorbates I

O 14.4: Talk

Monday, March 23, 2009, 15:45–16:00, SCH A316

Controlled formation of axially bonded Co-phthalocyanine dimers — Xin Ge¹, Carlos Manzano¹, •Richard Berndt¹, Lennart T. Anger², Felix Köhler², and Rainer Herges² — ¹Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität, D-24098 Kiel — ²Otto Diels-Institut für Organische Chemie, Christian-Albrechts-Universität, D-24098 Kiel

STM is used to laterally move single Co-Phthalocyanine (CoPc) molecules on an ordered CoPc layer and to investigate the electronic states of the resulting structures. DFT calculations show that an axial Co–Co bond is formed from the d_z² orbitals when molecules are positioned almost vertically on top of each other. This leads to a substantial increase of the conductance of the molecular center at negative bias. The results demonstrate the critical importance of precisely controlling the molecular environment when investigating conductances. Moreover, the results show that axial bonding may be used to achieve three-dimensional molecular architectures on a surface and that STM can be used as a powerful tool to elucidate the nature of unusual chemical bonding modes. Financial support via SFB 677 is gratefully acknowledged.