Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 14: Bio- and Molecular Magnetism
MA 14.10: Vortrag
Dienstag, 1. April 2014, 12:00–12:15, HSZ 401
A Spin-Crossover Complex on Surfaces — •Matthias Bernien1, Thiruvancheril G. Gopakumar2, Holger Naggert3, Francesca Matino2, Christian F. Hermanns1, Alexander Bannwarth3, Svenja Mühlenberend2, Alex Krüger1, Dennis Krüger1, Fabian Nickel1, Waldemar Walter1, Richard Berndt2, Wolfgang Kuch1, and Felix Tuczek3 — 1Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin — 2Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel — 3Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, 24098 Kiel
The manipulation of the spin-state of molecules on surfaces is a promising route towards tailor-made molecular building blocks for spintronic devices. Spin crossover (SCO) molecules are appealing since their spin state can be switched by external stimuli, such as temperature and light. Recently, a lot of research has been devoted to vacuum-deposition of SCO molecules using neutral complexes.
We have studied submono-, mono-, and multilayers of the Fe(II) SCO complex [Fe(bpz)2(phen)] (bpz=dihydrobis(pyrazolyl)borate, phen=1,10-phenanthroline) by near-edge x-ray absorption fine structure and scanning tunneling microscopy. We find that [Fe(bpz)2(phen)] in direct contact with a Au(111) surface dissociates into the four-coordinate complexes, [Fe(bpz)2], and phen molecules. Molecules in the second layer, on the other hand, are intact and show a SCO transition. — Financial support by the DFG (Sfb 658 and 677) is gratefully acknowledged.