Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Posters: Bio/organic Molecules on Surfaces, Graphene, Solid/liquid interfaces, Metal Substrates, Electronic Structure Theory
O 36.26: Poster
Dienstag, 1. April 2014, 18:30–22:00, P1
Reversible conformational changes in manganese porphyrin molecules — •Xianwen Chen1, Christian Lotze1, Paul Stoll1, Nils Krane1, José I. Pascual1,2, and Katharina J. Franke1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Germany — 2CIC nanoGUNE San Sebastián, and Ikerbasque, Basque Foundation for Science, Bilbao, Spain
Using scanning tunneling microscopy and spectroscopy at 7 K, we investigate manganese tetra-pyridine-porphyrin (Mn-TPyP) molecules adsorbed on a Cu(111) surface. The molecules show notable structural flexibility, which leads to two adsorption states. The different adsorption configurations are characterized by two distinct orbital alignments. Noncontact Atomic Force Microscopy images indicate that the pyridine rings can lie in two meta-stable tilting angles on the surface. We can induce a reversible rotation of single legs or pairs of legs by the tip of the scanning tunneling microscope with a threshold voltage around 2V.