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O: Fachverband Oberflächenphysik

O 12: Oxides and insulators: Adsorption

O 12.7: Vortrag

Montag, 22. März 2010, 16:30–16:45, H33

Orbital symmetries in Cu(II)-tetraazaphthtalocyanine isomers — •Tobias Sonnleitner, Ingmar Swart, Niko Pavliček, Christof Uhlmann, and Jascha Repp — Institute of Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany

Ultrathin insulating films on metal substrates facilitate the use of the scanning tunneling microscope to study the electronic properties of individual molecules, which are electronically decoupled from the metallic substrate. To gain a detailed understanding of the molecular properties, it is desirable to systematically vary the electronic structure of molecules step by step without changing the geometrical structure too strongly. Cu(II)-tetraazaphthalocyanine molecules provide such a model system. For these molecules four classes of isomers with different symmetries exist. These symmetries are directly visualized by imaging of the unperturbed molecular orbitals. This allows us to determine the isomer under study, and locate the nitrogen atoms in the molecular structure. DFT calculations substantiate the experimental findings.