Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 65: Surface and Interface Magnetism II (jointly with MA)
O 65.10: Vortrag
Donnerstag, 14. März 2013, 12:45–13:00, H33
Structural and magnetic properties of pyridyl and benzonitrile based metal-organic networks — •Tobias R. Umbach1, Matthias Bernien1, Claudia Hartmann1, Alexander Krüger1, Janina N. Ladenthin1, Constantin Czekelius2, Jose I. Pascual1,3, Katharina J. Franke1, and Wolfgang Kuch1 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2Institut für Chemie und Biochemie - Organische Chemie, Freie Universität Berlin Takustr. 3, 14195, Berlin, Germany — 3CIC nanoGUNE Consolider, Tolosa Hiribidea, 76, E-20018 Donostia , San Sebastian, Spain
Metal-organic networks offer the possibility to tune the electronic and magnetic functionality of surfaces on a nanometer scale. Here we use LT-STM to characterize the structure of metal-organic networks of transition metal atoms (Co, Fe) and triangular organic linkers, which exhibit either three pyridyl or three benzonitrile endgroups on Au(111). In the case of benzonitrile endgroups, the mixture with transition metal atoms leads to the formation of self-assembled ordered networks with a honeycomb structure. Every transition metal atom is surrounded by three benzonitrile groups forming three-fold coordination nodes. By changing the endgroups to pyridyl, the coordination motif changes significantly. The transition metal atoms exhibit the same in-plane coordination scheme with an additional molecule centered on top. The magnetic properties of the networks are investigated by XMCD measurements, which reveal that, despite their different structures, they all exhibit sizable magnetic moments and magnetic anisotropy.