Switching the magnetic hysteresis of an [Feii–NC–Wv]-based coordination polymer by photoinduced reversible spin crossover

Liang Zhao, Yin Shan Meng, Qiang Liu, Osamu Sato, Quan Shi, Hiroki Oshio, Tao Liu

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26 Citations (Scopus)


Magnetic bistable materials that feature magnetic hysteresis are comparable to elementary binary units and promising for application in switches and memory devices. In this work, we report a material that consists of parallel cyanide-bridged [Feii–Wv] coordination chains linked together through rigid bis(imidazolyl)–benzene ligands and displays multiple magnetic states. The paramagnetic high-spin and diamagnetic low-spin states of the spin-crossover Feii ions can be interconverted by reversible light-induced excited spin state trapping (LIESST) by alternating between light irradiation of 808 and 473 nm. At 1.8 K, under 808-nm-light irradiation, magnetic interactions between the photogenerated paramagnetic high-spin Feii centres and the Wv centres lead to long fragments that exhibit single-chain magnet behaviour, with a wide magnetic hysteresis and a large coercive field of 19 kOe; under a 473 nm light, isolated Feii–Wv fragments behave as single-molecule magnets instead. At 3.3 K, the high-spin form still displays magnetic hysteresis, albeit narrower, whereas the low-spin one does not. [Figure not available: see fulltext.]

Original languageEnglish
Pages (from-to)698-704
Number of pages7
JournalNature Chemistry
Issue number7
Publication statusPublished - Jul 2021

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)


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