Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 96: Focus Session: Molecular Nanostructures on surfaces - New Concepts towards Complex Architectures VI
O 96.5: Vortrag
Donnerstag, 15. März 2018, 16:00–16:15, MA 004
Site-Dependent Conformation of Fe-phthalocyanine on Fe/W(001) — •Alexander Schwarz, Josef Grenz, and Roland Wiesendanger — INF, University of Hamburg, Jungiusstr. 11, 20355 Hamburg
Molecules possess many degrees of freedom and are thus able to adsorb on the same surface on different sites, in different orientation and conformations. Here, we present submolecular resolution results obtained with atomic force microscopy in the non-contact mode of operation at low temperatures on well separated Fe-phtalocyanine molecules deposited onto the Fe monolayer on W(001).
The molecules adsorbs with its central Fe atom on hollow-, bridge- and top-sites in different orientations relative to the substrate. Only on hollow sites the molecule appears planar with a fourfold C4 symmetry and a central protrusion. On the other two adsorptions sites the central region always exhibits a depression and the outer isoindole ligands appear distorted, which results in a reduced symmetry. We will discuss the origin of the distortion and the role of the bonding between the substrate and the central Fe atom of the molecule as well as the importance of the interaction between the nitrogen atoms in the macrocycle and the substrate.