Spin Frustration from cis-Edge or -Corner Sharing Metal-Centered Octahedra

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• 作者：Romain Gautier ; Kengo Oka ; Takumi Kihara ; Nitesh Kumar ; Athinarayanan Sundaresan ; Masashi Tokunaga ; Masaki Azuma ; Kenneth R. Poeppelmeier
• 刊名：Journal of the American Chemical Society
• 出版年：2013
• 出版时间：December 26, 2013
• 年：2013
• 卷：135
• 期：51
• 页码：19268-19274
• 全文大小：460K
• ISSN：1520-5126

文摘

A new strategy using cis-edge or -corner sharing metal-centered octahedra is described which enables interesting frustrated spin lattices to be targeted. The examination of 鈥淐uV₂鈥?triangular motifs in the two new compounds [enH₂]Cu(H₂O)₂[V₂O₂F₈] (1) and [Cu(H₂O)(2,2鈥?bpy)]₂[V₂O₂F₈] (2) (where enH₂ = ethylenediammonium and 2,2鈥?bpy =2,2鈥?bipyridyl) reveals that the [VOF₄]^{2鈥?/sup> anions, which exhibit cis structure directing properties, lead to frustrated lattices owing to the competing ferro and antiferromagnetic interactions. There is direct coordination through two cis F鈥?/sup> ligands (i.e., the F鈥?/sup> ligand trans to O2鈥?/sup> and one equatorial F鈥?/sup> ligand) in both 1 and 2 owing to the significant 蟺-bonding between the vanadium and the oxide ligand. We emphasize that most of triangular motifs reported in the literature are built of cis-edge or -corner sharing metal-centered octahedra, thus they can be used to target new materials exhibiting interesting magnetism such as spin frustration.}