Dresden 2011 – scientific programme
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MO: Fachverband Molekülphysik
MO 11: Poster: Transport and Spectroscopy in Molecular Nanostructures (Intersectional Session with CPP)
MO 11.9: Poster
Tuesday, March 15, 2011, 18:00–20:00, P1
Mapping the spin states of Fe(II) spin-crossover compounds by STM — •Michael Stocker1, Sven Besendörfer1, Katja Student2, Andreas Grohmann2, and Paul Müller1 — 1Department of Physics and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Germany. — 2Institut für Chemie, Technische Universität Berlin, Germany.
We present measurements of the spin state of Fe(II) spin-crossover (SCO) compounds by STM spectroscopy. The talk focuses on the investigation of [FeL2]2+ [L = 2,6-di(pyrazol-1-yl)pyridine]. Measurements of small clusters of the molecule deposited onto HOPG surfaces are shown and compared to the results of previous measurements of Fe(II) SCO compounds as well as measurements of a solely high-spin compound with a similar coordination motif1. The different spin states exhibit a strong contrast in the current maps of CITS measurements. At room temperature, a reversal of both spin states was observed on a timescale of minutes. We also found indications for a dependence of the spin state on the surface matching of the deposited clusters.
1 M.S. Alam, M. Stocker, K. Gieb, P. Müller, M. Haryono, K. Student, A. Grohmann, Angew. Chem. Int. Ed. 49, 1159 (2010).