Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.73: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster B
[Mn6IIICrIII]3+-SMMs and its counterions on HOPG analyzed by Means of FM-KPFM — •Aaron Gryzia1, Natalie Frese1, Armin Brechling1, Ulrich Heinzmann1, Veronika Hoeke2, and Thorsten Glaser2 — 1Molecular and Surface Physics, Bielefeld University — 2Anorganic Chemistry I, Bielefeld University
[Mn6IIICrIII]3+ is a single-molecule-magnet (SMM) consisting of two bowl-shaped fragments, each containing three Mn-atoms, which are bridged by a central Cr-complex. For charge neutrality, counterions have to be coupled to the SMM. The SMM creates different kinds of structures on HOPG such as flat islands consisting of one or two layers of [Mn6IIICrIII]3+ or agglomerations at step edges. Data is acquired by means of nc-AFM. The position of the counterions is not yet known exactly, neither can they, if visible, be discriminated from the SMM by AFM. We expect the counterions to have a big influence on how the SMM adsorbs onto the substrate. The SMM is triply positive charged and each counterion carries a negative charge therefore differences in the contact potentials occur. If these differences are strong enough we are able to observe them and identify the SMM and its counterions by means of FM-KPFM (Frequency Modulated - Kelvin Probe Force Microscopy). Most recent results of our KPFM-Data will be shown and discussed with respect to the counterions.