Resolving the Unpaired‐Electron Orbital Distribution in a Stable Organic Radical by Kondo Resonance Mapping

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  • Laerte L. Patera
    Institute of Experimental and Applied Physics University of Regensburg 93053 Regensburg Germany
  • Sophia Sokolov
    Institute of Experimental and Applied Physics University of Regensburg 93053 Regensburg Germany
  • Jonathan Z. Low
    Department of Chemistry Columbia University New York NY 10027 USA
  • Luis M. Campos
    Department of Chemistry Columbia University New York NY 10027 USA
  • Latha Venkataraman
    Department of Chemistry Columbia University New York NY 10027 USA
  • Jascha Repp
    Institute of Experimental and Applied Physics University of Regensburg 93053 Regensburg Germany

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<jats:title>Abstract</jats:title><jats:p>The adsorption geometry and the electronic structure of a Blatter radical derivative on a gold surface were investigated by a combination of high‐resolution noncontact atomic force microscopy and scanning tunneling microscopy. While the hybridization with the substrate hinders direct access to the molecular states, we show that the unpaired‐electron orbital can be probed with Ångström resolution by mapping the spatial distribution of the Kondo resonance. The Blatter derivative features a peculiar delocalization of the unpaired‐electron orbital over some but not all moieties of the molecule, such that the Kondo signature can be related to the spatial fingerprint of the orbital. We observe a direct correspondence between these two quantities, including a pronounced nodal plane structure. Finally, we demonstrate that the spatial signature of the Kondo resonance also persists upon noncovalent dimerization of molecules.</jats:p>

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