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O: Fachverband Oberflächenphysik

O 83: Organic molecules on inorganic substrates: electronic, optical and other properties III

O 83.1: Vortrag

Donnerstag, 12. März 2026, 15:00–15:15, HSZ/0201

Spin-Crossover and Structural Correlation in Surface Confined Indigo-Based Fe-Coordination Polymers — •Mohammad Salehi¹, Aliki Soufla², Hongxiang Xu^1,5, Fulden Eratam³, David A. Duncan^3,4, Tien-Lin Lee³, Joachim Reichert¹, Johannes V. Barth¹, and Anthoula C. Papageorgiou² — ¹Technical University of Munich, DE — ²National and Kapodistrian University of Athens, GR — ³Diamond Light Source, UK — ⁴University of Nottingham, UK — ⁵Peking University, CN

Surface confined coordination polymers (CPs) exhibiting spin-crossover (SCO) behavior hold promise for molecular spintronics. By harnessing the natural dye indigo as a molecular building block, we investigated [Fe-indigo]_n CPs on Ag(111). Sub-molecular resolution scanning tunnelling microscopy (STM) and atomic force microscopy (AFM) confirmed well-defined CPs. We employed Fe L-edge X-ray absorption near-edge spectroscopy and high-resolution Fe 2p soft X-ray photoelectron spectroscopy to probe the spin states of Fe-indigo CPs at different temperatures. The data analysis supports thermally activated spin-crossover behavior, as predicted by density functional theory calculations. Normal incidence X-ray standing wave analysis yielded varying adsorption heights of Fe centers. We correlate the spin state with structural variations, revealing the interplay between ligand fields and magnetic properties.

Keywords: Spin-Crossover; Molecular Spintronics; X-ray Standing Waves