Regensburg 2010 – wissenschaftliches Programm

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KR: Fachverband Kristallographie

KR 10: Poster: Multiferroics (with MA, DF, KR, DS)

KR 10.11: Poster

Dienstag, 23. März 2010, 10:45–13:45, Poster A

Homogenous adsorption of Mn₆Cr single-molecule-magnets on substrates — •Peter Koop¹, Aaron Gryzia¹, Andreas Helmstedt¹, Wiebke Hachmann¹, Armin Brechling¹, Marc Sacher¹, Ulrich Heinzmann¹, Veronika Höke², and Thorsten Glaser² — ¹Molecular and Surface Physics, Bielefeld University — ²Anorganic Chemistry I, Bielefeld University

Mn₆Cr is a single-molecule-magnet (SMM) consisting of two bowl-shaped compounds, each containing three Mn-atoms. These compounds are bound together by a Cr-complex. For charge neutrality, counterions have to be coupled to the SMM. Investigation of separated SMM, the molecule-substrate interaction and/or possible future applications e.g. data storage, requires preparation of monolayers or thin films. This preparation is done by solving Mn₆Cr in methanol, and dropping few µl of the solution onto a 9x9 mm sized substrate. Depending on the choice of substrate Au, SiO₂ (native Oxide, 50 nm Oxide), HOPG, Ru, Mn₆Cr concentration, the angle of the sample while being preparated and the amount of applied solution Mn₆Cr yields strongly varying kinds of assembly. On the one hand, clusters emerge in the solution just a moment before the solvent dries, depending on the concentration of Mn₆Cr in the solution. On the other hand the lateral distribution of the SMM is correlated with the droplet-size, the angle of the sample during preparation and the counterions, e.g. lactate anions cause Mn₆Cr to create membranes. The samples have been investigated by means of optical microscopy, SEM, surface profilometry and AFM.