[Fe{13) O{4) F{24) {OMe}{12) ]{5-) の合成と構造:最初の開いた殻のケギンイオンである
Avi Bino1, Michael Ardon, Dongwhan Lee
1Department of Inorganic and Analytical Chemistry, The Hebrew University of Jerusalem, 91904 Jerusalem, Israel. bino@vms.huji.ac.il
Journal of the American Chemical Society
|April 25, 2002
まとめ
研究者は,Td対称性を持つ13個の鉄原子を特徴とする新しい鉄 (III) ケギンイオンを合成しました. 磁気研究は,これらの鉄の中心間の強い相互作用を明らかにし,ユニークな磁気特性を示しています.
科学分野:
- 無機化学 無機化学とは
- マテリアルサイエンス 材料科学
- マグネト化学 マグネト化学
背景:
- 独特の構造および磁性特性を有する新種のポリオキソメタラート合成は,活発な研究分野である.
- ケギンイオンは,ポリオキソメタレートの確立されたクラスですが,複数のパラマグネティックセンターを持つオープンシェル型はあまり一般的ではありません.
研究 の 目的:
- 高い対称性を持つ新しい鉄を含むKegginイオンを合成し,特徴づけること.
- 新しく合成された複合体の構造および磁気特性を調査する.
主な方法:
- メタノールにおけるフッ化鉄三水素とピリジンの反応による結晶化.
- 構造的決定のための単結晶X線 difraktion.
- 磁気相互作用を検出するための磁気感受性測定.
主要な成果:
- (PyH) 5.の黄茶色の結晶の合成に成功した. [Fe13O4F24(OMe) ][12]. 4H2O.CH3OH. 4H2O.CH3OH. 4H2O.CH3OH. 4H2O.CH3OH. 4H2O.CH3OH.
- 完全Td対称性を持つアニオン複合体 [Fe13O4F24(OMe) [12]5- (1) の特徴,13個の高スピンd5鉄(III) 原子からなる.
- 構造分析は,メト酸化物とフッ素リガンドによって橋渡しされた12個の八面体鉄原子に囲まれた中央の四面体 {FeO4} ユニットを明らかにしました.
- 磁気感受性研究では,鉄原子間の強力な反鉄磁気交換相互作用が示され,結合されていない中心と比較して,効果磁気モメント (μeff = 19.3 μB,300 K) が著しく低下していることが示されています.
結論:
- 13個の鉄 (III) 原子とTd対称性を持つ開いた殻のKegginイオンの最初の例が合成されました.
- 複合体は,強力な分子内磁気交換相互作用を示し,ユニークな磁気行動につながります.
- この発見は,ポリオキソメタラート構造に基づく磁性材料の設計に新しい道を開く.
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