Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 83: Organic molecules on inorganic substrates: electronic, optical and other properties III
O 83.1: Talk
Thursday, March 12, 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 Xu1,5, Fulden Eratam3, David A. Duncan3,4, 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