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Evolution of cooperativity in the spin transition of an iron(II) complex on a graphite surface

Author

Listed:
  • Lalminthang Kipgen

    (Freie Universität Berlin)

  • Matthias Bernien

    (Freie Universität Berlin)

  • Sascha Ossinger

    (Christian-Albrechts-Universität zu Kiel)

  • Fabian Nickel

    (Freie Universität Berlin)

  • Andrew J. Britton

    (Freie Universität Berlin)

  • Lucas M. Arruda

    (Freie Universität Berlin)

  • Holger Naggert

    (Christian-Albrechts-Universität zu Kiel)

  • Chen Luo

    (Universität Regensburg)

  • Christian Lotze

    (Freie Universität Berlin)

  • Hanjo Ryll

    (Helmholtz-Zentrum Berlin für Materialien und Energie)

  • Florin Radu

    (Helmholtz-Zentrum Berlin für Materialien und Energie)

  • Enrico Schierle

    (Helmholtz-Zentrum Berlin für Materialien und Energie)

  • Eugen Weschke

    (Helmholtz-Zentrum Berlin für Materialien und Energie)

  • Felix Tuczek

    (Christian-Albrechts-Universität zu Kiel)

  • Wolfgang Kuch

    (Freie Universität Berlin)

Abstract

Cooperative effects determine the spin-state bistability of spin-crossover molecules (SCMs). Herein, the ultimate scale limit at which cooperative spin switching becomes effective is investigated in a complex [Fe(H2B(pz)2)2(bipy)] deposited on a highly oriented pyrolytic graphite surface, using x-ray absorption spectroscopy. This system exhibits a complete thermal- and light-induced spin transition at thicknesses ranging from submonolayers to multilayers. On increasing the coverage from 0.35(4) to 10(1) monolayers, the width of the temperature-induced spin transition curve narrows significantly, evidencing the buildup of cooperative effects. While the molecules at the submonolayers exhibit an apparent anticooperative behavior, the multilayers starting from a double-layer exhibit a distinctly cooperative spin switching, with a free-molecule-like behavior indicated at around a monolayer. These observations will serve as useful guidelines in designing SCM-based devices.

Suggested Citation

  • Lalminthang Kipgen & Matthias Bernien & Sascha Ossinger & Fabian Nickel & Andrew J. Britton & Lucas M. Arruda & Holger Naggert & Chen Luo & Christian Lotze & Hanjo Ryll & Florin Radu & Enrico Schierle, 2018. "Evolution of cooperativity in the spin transition of an iron(II) complex on a graphite surface," Nature Communications, Nature, vol. 9(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-05399-8
    DOI: 10.1038/s41467-018-05399-8
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