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Cooperative spin crossover leading to bistable and multi-inert system states in an iron(III) complex

Author

Listed:
  • Andreas Dürrmann

    (Humboldtstraße 8
    Universitätsstraße 30)

  • Gerald Hörner

    (Humboldtstraße 8
    Universitätsstraße 30)

  • Dirk Baabe

    (Hagenring 30)

  • Frank W. Heinemann

    (Egerlandstr. 1)

  • Mauricio A. C. Melo

    (Universidade Estadual de Maringá)

  • Birgit Weber

    (Humboldtstraße 8
    Universitätsstraße 30)

Abstract

Cooperativity among spin centres has long been the royal road in spin crossover (SCO) research to impose magnetic bistability in terms of thermal hysteresis. In this work we access magnetic multi-inert states of the iron(III) compound {FeL2[B(Ph)4]} ≡ FeB at low temperature, in addition to thermal bistability. The packing of the low-spin and high-spin forms of crystalline FeB differs only marginally what ultimately leads to structural conservatism. This indicates that the SCO-immanent breathing of the complex cation is almost fully compensated by the anion matrix. The unique cooling rate dependence of the residual low-temperature magnetisation in FeB unveils continuous switching between the trapped high-spin (ON) and the relaxed low-spin state (OFF). The macroscopic ratio of the spin states (ON:OFF) can be adjusted as a simple function of the cooling rate. That is, cooperative spin crossover can be the source of bistable and multi-inert system states in the very same material.

Suggested Citation

  • Andreas Dürrmann & Gerald Hörner & Dirk Baabe & Frank W. Heinemann & Mauricio A. C. Melo & Birgit Weber, 2024. "Cooperative spin crossover leading to bistable and multi-inert system states in an iron(III) complex," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-51675-1
    DOI: 10.1038/s41467-024-51675-1
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    1. Takuto Matsumoto & Graham N. Newton & Takuya Shiga & Shinya Hayami & Yuta Matsui & Hiroshi Okamoto & Reiji Kumai & Youichi Murakami & Hiroki Oshio, 2014. "Programmable spin-state switching in a mixed-valence spin-crossover iron grid," Nature Communications, Nature, vol. 5(1), pages 1-8, September.
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