Thermally Induced Valence Tautomeric Transition in a Two‐Dimensional Fe‐Tetraoxolene Honeycomb Network |
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| Authors: | Jian Chen Dr Yoshihiro Sekine Yuki Komatsumaru Prof Dr Shinya Hayami Prof Dr Hitoshi Miyasaka |
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| Institution: | 1. Institute for Materials Research (IMR), Tohoku University, Aoba-ku, Sendai, Japan;2. Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai, Japan;3. Department of Chemistry, Faculty of Advanced Science and Technology, Kumamoto University, Chuo-ku, Kumamoto, Japan;4. Institute of Pulsed Power Science (IPPS), Kumamoto University, Chuo-ku, Kumamoto, Japan |
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| Abstract: | A novel tetraoxolene‐bridged Fe two‐dimensional honeycomb layered compound, (NPr4)2Fe2(Cl2An)3] ?2 (acetone)?H2O ( 1 ), where Cl2Ann?=2,5‐dichloro‐3,6‐dihydroxy‐1,4‐benzoquinonate and NPr4+=tetrapropylammonium cation, has been synthesized. 1 revealed a thermally induced valence tautomeric transition at T1/2=236 K (cooling)/237 K (heating) between Fem+ (m=2 or 3) and Cl2Ann? (n=2 or 3) that induced valence modulations between FeIIHSFeIIIHS(Cl2An2?)2(Cl2An.3?)]2? at T>T1/2 and FeIIIHSFeIIIHS(Cl2An2?)(Cl2An.3?)2]2? at T<T1/2. Even in a two‐dimensional network structure, the low‐temperature phase FeIIIHSFeIIIHS(Cl2An2?)(Cl2An.3?)2]2? valence set can be regarded as a magnetic chain‐knit network, where ferrimagnetic Δ and Λ chains of FeIIIHS(Cl2An.3?)]∞ are alternately linked by the diamagnetic Cl2An2?. This results in a slow magnetization behavior attributed to the structure acting as a single‐chain magnet at lower temperatures. |
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| Keywords: | electron transfer layered compounds magnetic properties single-chain magnets valence tautomerism |
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