Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: Poster 1
MA 19.19: Poster
Dienstag, 6. September 2022, 17:30–20:00, P2
X-ray absorption and differential reflectance spectroscopies of spin-crossover molecules on HOPG — •Jorge Torres1, Sascha Ossinger2, Sangeeta Thakur1, Clara W.A. Trommer2, Marcel Walter1, Ivar Kumberg1, Rahil Hosseinifar1, Evangelos Golias1, Sebastien Hadjadj1, Jendrik Gördes1, Pin-Chi Liu1, Chen Luo3, Lalminthang Kipgen1, Tauqir Shinwari1, Florin Radu3, Felix Tuczek2, and Wolfgang Kuch1 — 1Freie Universität Berlin, Institut für Experimentalphysik, Berlin, Germany — 2Christian-Albrechts-Universität zu Kiel, Institut für Anorganische Chemie, Kiel, Germany — 3Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin, Germany
In order to use visible light to observe the switching between the high spin (HS) and low spin (LS) state of a [Fe{H2B(pzpy)pz}2] [1] spin-crossover molecule (SCM), a sub-monolayer was deposited on highly oriented pyrolytic graphite (HOPG) and the sample temperature varied from 120 to 350 K. The difference in light reflection between the pristine HOPG and the SCM sub-monolayer was analyzed by differential reflectance spectroscopy (DRS). Furthermore, the total HS fraction obtained from X-ray absorption spectroscopy (XAS) at temperatures ranging from 10 to 350 K was compared to the DRS absorption spectra. A systematic absorption in the UV region shows that the intensity is proportional to the temperature. Here, the ligand-centered absorption is stronger than the metal-to-ligand charge transfer, making this SCM a promising candidate for optically switched storage devices at room temperature. [1] S. Ossinger, Inorg. Chem., 2020, 59, 7966-7979