SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 75: Poster Session VI: Organic molecules on inorganic substrates: electronic, optical and other properties II
O 75.3: Poster
Mittwoch, 3. März 2021, 13:30–15:30, P
'Magnetic Coupling in Clusters of Rhombus-Shaped Nanographenes — •Nils Krane1, Xuelin Yao2, Qiang Chen2, Kristjan Eimre1, Carlo A. Pignedoli1, Klaus Müllen2, Pascal Ruffieux1, Akimitsu Narita2,3, and Roman Fasel1,4 — 1nanotech@surfaces Laboratory, Empa - Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland — 2Department of Synthetic Chemistry, Max Planck Institute for Polymer Research, Mainz, Germany — 3Organic and Carbon Nanomaterials Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, Ja-pan — 4Department of Chemistry and Biochemistry, University of Bern, Bern, Switzerland
The exact tailoring of open-shell nanographenes (NGs) with non-trivial magnetic ground states opens a pathway towards carbon-based molecular spintronics. The synthesis of these NGs remains challenging, due to their high reactivity. Embedding the NGs into a non-magnetic molecular network on the surface could allow for a passivation and more controlled growth.
In this work, we passivated 5-rhombenes [1] with p-terphenyl linkers, creating one-dimensional non-magnetic backbones in which the NGs are embedded. Scanning tunneling spectroscopy and inelastic electron tunneling spectroscopy reveal the antiferromagnetic ground state with a large magnetic coupling constant to be preserved upon passivation. Furthermore, magnetically coupled dimers of 5-rhombenes embedded in the phenyl backbone have been investigated.
[1]: Mishra et al.: https://arxiv.org/abs/2003.03577 (2020)