Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 20: Bio- and Molecular Magnetism
MA 20.3: Talk
Tuesday, March 21, 2017, 10:00–10:15, HSZ 301
Switching of a spin-crossover molecule on a surface — •Torben Jasper-Tönnies1, Sujoy Karan1, Hanne Jacob2, Felix Tuczek2, and Richard Berndt1 — 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel — 2Institut für Anorganische Chemie, Christian-Albrechts-Universität zu Kiel, 24098 Kiel
Spin-crossover (SCO) complexes contain a transition metal ion that can be switched between a low-spin and a high-spin state by external stimuli. An adsorbed SCO complex couples to the substrate and consequently may change its spin-switching property. Using low temperature scanning tunneling microscopy we investigated the SCO-compound [Fe(pap)2]+ClO4− (pap= N-2-pyridylmethylidene-2-hydroxyphenylaminato) on substrates with supposedly different couplings to the molecule, namely Au(111), Cu(001) and Cu2N/Cu(001). Although we made various attempts, we found no indication of any STM tip induced modifications of Fe(pap)2 on Au and Cu. By contrast, single Fe(pap)2 on Cu2N can be reproducibly and reversibly switched. We observed three states that exhibit different shapes in images and different spectroscopic features. We discuss the data in terms of conformational changes as well as spin-state modifications. Financial support by the SFB 677 is gratefully acknowledged.