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Humidity-induced magnetization and magnetic pole inversion in a cyano-bridged metal assembly

Nature Materials volume 3, pages 857–861 (2004)Cite this article

Abstract

In general, magnetic properties of bulk magnetic materials are independent of the humidity of the environment. To obtain a magnetic material that has humidity-sensitive characteristics, water vapour must penetrate the lattice and act on spin sites. Nanoporous materials composed of metal-assembled complexes1,2,3,4 may be expected to display some humidity response because materials in this category can show functionalities such as gas storage and molecular recognition. Here, we demonstrate humidity-induced reversible variations in the magnetic properties of cyano-bridged cobalt(II)–manganese(II)–chromium(III) metal assemblies. The observed magnetic humidity response is due to adsorption and desorption of a ligand water molecule on the cobalt ion, which changes cobalt (II) between a 6- and 4-fold coordination geometry and switches the magnetic interaction between ferromagnetic coupling and antiferromagnetic coupling.

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Figure 1: Changes in colour and magnetic properties of CoII[CrIII(CN)6]2/3·zH2O and (CoII0.41MnII0.59)[CrIII(CN)6]2/3·zH2O depend on the humidity.
Figure 2: Variations in water content, an optical property, and crystal structure of CoII[CrIII(CN)6]2/3·zH2O depend on the humidity.
Figure 3: Mechanism of the humidity-induced change in magnetization on CoII[CrIII(CN)6]2/3·zH2O.
Figure 4: Mechanism of the humidity-induced magnetic pole inversion on (CoII0.41MnII0.59)[CrIII(CN)6]2/3·zH2O.

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Acknowledgements

The authors thank H. Tokoro for preparing the colour illustration. The present research is supported in part by a Grant for 21st Century COE Program Human-Friendly Materials based on Chemistry and a Grand-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology of Japan.

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Authors and Affiliations

  1. Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan

    Shin-ichi Ohkoshi, Ken-ichi Arai, Yusuke Sato & Kazuhito Hashimoto

  2. PRESTO, Japan Science and Technology, 4-1-8 Honcho Kawaguchi, Saitama, 332-0012, Japan

    Shin-ichi Ohkoshi

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  1. Shin-ichi Ohkoshi
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  2. Ken-ichi Arai
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  3. Yusuke Sato
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Correspondence to Shin-ichi Ohkoshi or Kazuhito Hashimoto.

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Ohkoshi, Si., Arai, Ki., Sato, Y. et al. Humidity-induced magnetization and magnetic pole inversion in a cyano-bridged metal assembly. Nature Mater 3, 857–861 (2004). https://doi.org/10.1038/nmat1260

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