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Low JZ, Kladnik G, Patera LL, et al. The Environment-Dependent Behavior of the Blatter Radical at the Metal-Molecule Interface. Nano Lett. 2019;19(4):2543-2548doi: 10.1021/acs.nanolett.9b00275.
Low, J. Z., Kladnik, G., Patera, L. L., Sokolov, S., Lovat, G., Kumarasamy, E., Repp, J., Campos, L. M., Cvetko, D., Morgante, A., & Venkataraman, L. (2019). The Environment-Dependent Behavior of the Blatter Radical at the Metal-Molecule Interface. Nano letters, 19(4), 2543-2548. https://doi.org/10.1021/acs.nanolett.9b00275
Low, Jonathan Z, et al. "The Environment-Dependent Behavior of the Blatter Radical at the Metal-Molecule Interface." Nano letters vol. 19,4 (2019): 2543-2548. doi: https://doi.org/10.1021/acs.nanolett.9b00275
Low JZ, Kladnik G, Patera LL, Sokolov S, Lovat G, Kumarasamy E, Repp J, Campos LM, Cvetko D, Morgante A, Venkataraman L. The Environment-Dependent Behavior of the Blatter Radical at the Metal-Molecule Interface. Nano Lett. 2019 Apr 10;19(4):2543-2548. doi: 10.1021/acs.nanolett.9b00275. Epub 2019 Mar 25. PMID: 30884240.
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Nano Lett. 2019 Apr 10;19(4):2543-2548. doi: 10.1021/acs.nanolett.9b00275. Epub 2019 Mar 25.

The Environment-Dependent Behavior of the Blatter Radical at the Metal-Molecule Interface.

Nano letters

Jonathan Z Low, Gregor Kladnik, Laerte L Patera, Sophia Sokolov, Giacomo Lovat, Elango Kumarasamy, Jascha Repp, Luis M Campos, Dean Cvetko, Alberto Morgante, Latha Venkataraman

Affiliations

  1. Department of Chemistry , Columbia University , New York , New York 10027 , United States.
  2. Faculty of Mathematics and Physics , University of Ljubljana , Jadranska 19 , SI-1000 Ljubljana , Slovenia.
  3. CNR-IOM Laboratorio Nazionale TASC , Basovizza, SS-14, km 163.5 , I-34012 Trieste , Italy.
  4. Institute of Experimental and Applied Physics , University of Regensburg , 93053 Regensburg , Germany.
  5. Department of Applied Physics and Applied Mathematics , Columbia University , New York , New York 10027 , United States.
  6. J. Stefan Institute , Jamova 39 , SI-1000 Ljubljana , Slovenia.
  7. Department of Physics , University of Trieste , 34127 Trieste , Italy.

PMID: 30884240 DOI: 10.1021/acs.nanolett.9b00275

Abstract

Stable organic radicals have potential applications for building organic spintronic devices. To fulfill this potential, the interface between organic radicals and metal electrodes must be well characterized. Here, through a combined effort that includes synthesis, scanning tunneling microscopy, X-ray spectroscopy, and single-molecule conductance measurements, we comprehensively probe the electronic interaction between gold metal electrodes and a benchtop stable radical-the Blatter radical. We find that despite its open-shell character and having a half-filled orbital close to the Fermi level, the radical is stable on a gold substrate under ultrahigh vacuum. We observe a Kondo resonance arising from the radical and spectroscopic signatures of its half-filled orbitals. By contrast, in solution-based single-molecule conductance measurements, the radical character is lost through oxidation with charge transfer occurring from the molecule to metal. Our experiments show that the stability of radical states can be very sensitive to the environment around the molecule.

Keywords: Blatter radical; Kondo resonance; Organic spintronics; organic radicals; single-molecule junctions; spinterface

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