Berlin 2008 – scientific programme

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O: Fachverband Oberflächenphysik

O 64: Metal Substrates: Adsorption of Organic/Bio Molecules IV

O 64.2: Talk

Thursday, February 28, 2008, 11:30–11:45, HE 101

A structural study of porphyrins interacting with a metallic surface — •Jens Brede, Germar Hoffmann, and Roland Wiesendanger — Institut of Applied, University of Hamburg

A Porphyrin is a heterocyclic macrocycle derived from pyrrolic subunits interconnected via methine bridges. Porphyrins are an ubiquitous class of naturally occurring compounds with important biological representatives including hemes and chlorophylls. We prepared various tetra phenyl prophyrins (TPP) with different central metal (M) ions on metallic substrates. The molecular systems were investigated by scanning tunnelling microscopy and spectroscopy. The experiments were performed in a home-built low temperature STM working at 6 K in ultra-high vacuum conditions. Upon deposition of porphyrins on metal substrates the aromatic core of the molecule may undergo a structural deformation depending on the details of the molecule-substrate interaction. We will discuss the structural conformation of TPPs and their electronic properties.