SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: Molecular Magnetism I
MA 19.3: Vortrag
Dienstag, 28. März 2023, 15:30–15:45, HSZ 04
Temperature-dependent Raman spectroscopy studies of a Fe(II) spin-crossover complex — •Lea Spieker1, Stephan Sleziona1, Gérald Kämmerer1, André Maas1, Soma Salamon1, Senthil Kumar Kuppusamy2, Mario Ruben2, Uwe Bovensiepen1, Peter Kratzer1, Marika Schleberger1, and Heiko Wende1 — 1Faculty of Physics and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen — 2Institute of Quantum Materials and Technologies (IQMT), Karlsruhe Institute of Technology
Spin-crossover complexes with a bi-stable spin-state switching in the room temperature regime, influenced by external stimuli such as light, pressure, or temperature, are desirable for future applications, e.g., molecular switches. Combining Raman spectroscopy with optical microscopy, we investigated a Fe(II) complex showing a spin-state switching from a diamagnetic low-spin (S=0) to a paramagnetic high-spin (S=2) state in the room temperature regime (T1/2=298 K) with a broad thermal hysteresis of Δ T = 44 K. Notable molecular bond changes during the temperature-induced spin-state switching are confirmed by Raman spectroscopy measurements combined with density functional theory calculations. In addition, optical microscopy during heating and cooling allowed us to observe the spin-state switching on a macroscopic scale. We gratefully acknowledge the financial support by CRC 1242 Projects A05, B02, and C05 (Project-ID 278162697).