Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 16: Surface Magnetism (joint session O/MA)

MA 16.5: Vortrag

Dienstag, 2. April 2019, 11:30–11:45, H37

Coordination-induced spin-state switching of a Ni complex on Ag(111) — •Manuel Gruber¹, Alexander Köbke¹, Florian Gutzeit², Rainer Herges², and Richard Berndt¹ — ¹Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Germany — ²Institut für Organische Chemie, Christian-Albrechts-Universität zu Kiel, Germany

The spin state of a transition-metal complexes (TMC) can be controlled by changing its coordination state. For TMC on surfaces, this was so far realized by adding/removing gaseous molecules [1] or by transferring a ligand (e.g. Cl) with the tip of a scanning tunneling microscope (STM) [2]. Alternatively, a switching unit within the TMCs itself may be employed to change the coordination state of the complex [3], but so far the interaction with the substrate was detrimental for the molecular structure and switching properties [4].

In the present study, we have designed and investigated robust Ni complexes, which can intrinsically switch their coordination state. Combining low-temperature scanning tunneling microscopy, near-edge x-ray absorption spectroscopy along with density functional theory calculations, we evidence the switching of these complexes on Ag(111) between the S=0 and S=1 spin states.

This work was supported by the DFG through SFB 677 and the European Union’s Horizon 2020 programme (No. 766726). [1] Gopakumar et al., J. Am. Chem. Soc. 134, 11844 (2012) [2] Wäckerlin et al., Adv. Mater. 25, 2404 (2013) [3] Venkataramani et al., Science 331, 445 (2011) [4] Matino et al., Chem. Commun. 46, 6780 (2010)