Berlin 2008 – wissenschaftliches Programm

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SYSA: Symposium Tayloring Organic Interfaces: Molecular Structures and Applications

SYSA 5: Poster Session SYSA

SYSA 5.40: Poster

Dienstag, 26. Februar 2008, 14:30–20:00, Poster A

Visualizing the Frontier Orbitals of a Conformationally Adapted Metalloporphyrin — •Joachim Reichert¹, Alexander Weber-Bargioni², Willi Auwärter¹, Florian Klappenberger¹, Agustin Schiffrin², Yan Pennec², and Johannes Barth¹ — ¹Physik Department E20, TU München, Munich, Germany — ²Departments of Chemistry and Physics & Astronomy, University of British Columbia, Vancouver, Canada

We present a molecular level study of the geometric and electronic properties of Co-tetraphenyl-porphyrin molecules adsorbed on the Cu(111) surface. Combined low-temperature scanning tunneling microscopy and near-edge X-ray absorption fine structure observations reveal how the metal substrate induces a conformational adaptation into a distorted saddle-shape geometry. By scanning tunneling spectroscopy we identify the molecules discrete energy levels and map their spatial electron density distributions. These results, along with a simple theoretical description, provide a direct correlation between the shape of frontier molecular orbitals and intramolecular structural features. In addition, it is demonstrated that the same concepts can be applied to address the interaction of cerium with surface anchored porphyrin host molecules.