Regensburg 2025 – scientific programme

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DS: Fachverband Dünne Schichten

DS 6: Thin Film Application

DS 6.7: Talk

Wednesday, March 19, 2025, 11:15–11:30, H3

T-dependent switching of molecular spin-crossover (SCO) monolayers — •Fabian Streller¹, Kirill Gubanov¹, Stephen Goodner², Marat Khusniyarov², and Rainer Fink¹ — ¹Lehrstuhl für Physikalische Chemie II, Friedrich Alexander Universität Erlangen Nürnberg — ²Lehrstuhl für Anorganische und Allgemeine Chemie, Friedrich Alexander Universität Erlangen Nürnberg

Spin-crossover (SCO) complexes are regarded as promising materials in spintronics, molecular electronics and ultra-high-density memory systems applications. Switching between diamagnetic low-spin (LS) and paramagnetic high-spin (HS) species is triggered by external stimuli, e.g., change of temperature, pressure, or illumination with light.[1] One major challenge is the transfer from solution or bulk towards thin films or even monolayers on well-defined surfaces without quenching of the switching behaviour. Six-coordinate iron(II) complexes have been used as SCO materials. This material is attached to the surface via a bidental phenanthroline ligand containing moieties suitable for bonding to the substrate. We report on a step-by-step formation of SCO-active single-layer films on Au(111) surfaces. Thus created specimens were characterized by atomic force microscopy (AFM), x-ray photoelectron spectroscopy (XPS) and temperature dependent near edge x-ray absorption fine structure (NEXAFS) to follow the molecular switching. Research is funded by the BMBF (contract 05K22WE2) [1] B. Rösner, M. Milek, A. Witt, B. Gobaut, P. Torelli, R. H. Fink, M. M. Khusniyarov Angewandte Chemie. 2015, 127, 13168-13172.

Keywords: SCO; Monolayer; switching