Published October 28, 2021 | Version v1
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Large magnetic exchange coupling in rhombus-shaped nanographenes with zigzag periphery

  • 1. Empa - Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, 8600 Dübendorf, Switzerland
  • 2. Department of Synthetic Chemistry, Max Planck Institute for Polymer Research, 55021 Mainz, Germany
  • 3. Department of Applied Physics, University of Alicante, Sant Vicent del Raspeig, Spain
  • 4. Department of Chemical Physics, University of Alicante, Sant Vicent del Raspeig, Spain
  • 5. QuantaLab, International Iberian Nanotechnology Laboratory, Braga, Portugal
  • 6. Organic and Carbon Nanomaterials Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa, Japan
  • 7. Department of Chemistry and Biochemistry, University of Bern, Bern, Switzerland

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Description

In this record we provide data to support our recent findings for the magnetic properties of rhombus-shaped nanographenes. Nanographenes with zigzag edges are predicted to manifest non-trivial π-magnetism resulting from the interplay of concurrent electronic effects, such as hybridization of localized frontier states and Coulomb repulsion between valence electrons. This provides a chemically tunable platform to explore quantum magnetism at the nanoscale and opens avenues towards organic spintronics. The magnetic stability in nanographenes is thus far greatly limited by the weak magnetic exchange coupling, which remains below the room-temperature thermal energy. In our work, we report the synthesis of large rhombus-shaped nanographenes with zigzag peripheries on gold and copper surfaces. Single-molecule scanning probe measurements show an emergent magnetic spin singlet ground state with increasing nanographene size. The magnetic exchange coupling in the largest nanographene (C70H22, containing five benzenoid rings along each edge), determined by inelastic electron tunnelling spectroscopy, exceeds 100 meV or 1,160 K, which outclasses most inorganic nanomaterials and survives on a metal electrode.

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References

Journal reference (Manuscript where the results are discussed)
S. Mishra, X. Yao, Q. Chen, K. Eimre, O. Gröning, R. Ortiz, M. Di Giovannantonio, J. C. Sancho-García, J. Fernández-Rossier, C. A. Pignedoli, K. Müllen, P. Ruffieux, A Narita and R. Fasel, Nat. Chem. 13, 581-586 (2021)., doi: 10.1038/s41557-021-00678-2