Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 33: Biomedical and molecular magnetism
MA 33.8: Vortrag
Mittwoch, 14. März 2018, 17:00–17:15, H 1012
Deposition and selective switching of a cationic Fe(III) compound on Au(111) and Cu2N — •Manuel Gruber1, Torben Jasper-Tönnies1, Sujoy Karan2, Hanne Jacob3, Felix Tuczek3, and Richard Berndt1 — 1Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität Kiel — 2Institute of Experimental and Applied Physics, University of Regensburg — 3Institut für Anorganische Chemie, Christian-Albrechts-Universität 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. Investigations of single SCO molecules is challenging as the interaction with the substrate often leads to fragmentation or loss of functionality. So far, the focus was on Fe(II) based molecules, while SCO complexes with different metal ions (different oxidation states) would be desirable.
Using scanning tunneling microscopy, we evidence the first successful deposition of a cationic Fe(III) SCO complex, [Fe(pap)2]+ (pap = N-2-pyridylmethylidene-2-hydroxyphe- nylaminato), on Au(111) and Cu2N/Cu(100). The deposited Fe(III) SCO compound is controllably switched between three different states, each of them exhibiting a characteristic tunneling conductance. The conductance is therefore employed to readily read the state of the molecules [1,2].
This work was supported by SFB 677.
[1] Jasper-Toennies et al., J. Phys. Chem. Lett. 8, 1569 (2017)
[2] Jasper-Toennies et al., Nano Lett. 17, 6613 (2017)