A Bimetallic Magnetic System Exhibiting Reversible Ferromagnetism/Metamagnetism Modulation

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  • Naoki Usuki
    Department of Chemistry, Faculty of Science, Kyushu UniversityHakozaki, Higashiku 6-10-1, Fukuoka 812-8581
  • Masaaki Ohba
    Department of Chemistry, Faculty of Science, Kyushu UniversityHakozaki, Higashiku 6-10-1, Fukuoka 812-8581
  • Hisashi Okawa
    Department of Chemistry, Faculty of Science, Kyushu UniversityHakozaki, Higashiku 6-10-1, Fukuoka 812-8581

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<jats:title>Abstract</jats:title> <jats:p>A cyanide-bridged bimetallic compound, [Ni(1,1-dmen)2]2[Fe(CN)6](BPDS)0.5·4H2O (1) (1,1-dmen = 1,1-dimethylethylenediamine, BPDS2− = biphenyl-4,4′-disulfonate), has been prepared. It has a pseudo 2-D network structure based on a Fe4Ni4 square unit with two Fe–CN–Ni–NC–Fe and two Fe–CN···H2O–Ni–NC–Fe linkages and shows a metamagnetic ordering with TC = 3.3 K. The dehydration of 1 at 150 °C has afforded [Ni(1,1-dmen)2]2[Fe(CN)6](BPDS)0.5 (1a). It has a definite 2-D network structure based on a Fe4Ni4 square unit with four Fe–CN–Ni–NC–Fe linkages and shows essentially a ferromagnetic ordering with TC = 10.7 K under weak applied field (&gt; 250 G). 1a is hygroscopic and adsorbed atmospheric moisture to afford [Ni(1,1-dmen)2]2[Fe(CN)6](BPDS)0.5·2H2O (1b), which has a pseudo 2-D network structure similar to that of 1 and shows a metamagnetic ordering with TC = 4.0 K. 1a and 1b can be interconverted by dehydration at 150 °C and hydration in open air at room temperature, producing a unique molecular magnetic system exhibiting a reversible ferromagnetism/metamagnetism modulation.</jats:p>

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