SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Posters Magnetism V
MA 18.32: Poster
Freitag, 1. Oktober 2021, 10:00–13:00, P
Light-, temperature-, and x-ray-induced spin-crossover transition of molecules adsorbed on a graphite surface — •Jorge Torres1, Lalminthang Kipgen1, Sascha Ossinger2, Sangeeta Thakur1, Clara W.A. Trommer2, Ivar Kumberg1, Rahil Hosseinifar1, Evangelos Golias1, Sebastien Hadjadj1, Jendrik Gördes1, Chen Luo3, Kai Chen3, 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
When iron spin-crossover molecules (SCM) are irradiated by light, their spin configuration can be excited from the ground state S0 to an exited state S1 and from there even to a metastable state of different multiplicity. For Fe(II) complexes this corresponds to a transition from low-spin (LS) to high-spin (HS) states. When the temperature is changed, this transition takes place in terms of thermodynamic effects. In this work we deposited different sub-, mono- and multilayer coverages of [Fe{(pzpy)pz}2] on highly oriented pyrolytic graphite and measured them by X-ray absorption spectroscopy. Analysis of the HS and LS fraction showed that for almost all samples the light-induced excited spin-state trapping (LIESST) effect resulted in twice the HS fraction than the thermally induced spin-state transition. The transition temperature T1/2 (50% HS and 50% LS) is located at 300 K, opening a window for potential applications at room temperature.