Spin Frustration from cis-Edge or -Corner Sharing Metal-Centered Octahedra
Spin Frustration from cis-Edge or -Corner Sharing Metal-Centered Octahedra
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DOI：
10.1021/ja409831h
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发表时间：
2013-12-25
影响因子：
15
通讯作者：
Poeppelmeier, Kenneth R.
中科院分区：
文献类型：
--
作者：
Gautier, Romain;Oka, Kengo;Poeppelmeier, Kenneth R.
本文提出了一种新的策略，利用顺式边或角共享的金属中心八面体，使有趣的受挫自旋晶格成为目标。研究了两个新化合物[enH（2）]Cu（H_2O）（2）[V_2O_2F_8]（1）和[Cu（H_2O）]中的“CuV_2”三角模体（2，2'-bpy）]（2）[V2O2F8]（2）（其中enH（2）=乙二铵，2，2 '-bpy = 2，2'-联吡啶）表明，[VOF 4]（2-）阴离子具有顺式结构导向特性，由于竞争的铁磁和反铁磁相互作用导致受抑晶格。存在通过两个顺式F-配体的直接配位（即，由于钒和氧化物配体之间的显著π-键合，1和2中的F-配体反式为O2-和一个赤道F-配体）。我们强调，文献中报道的大多数三角形图案都是由顺式边或角共享金属中心八面体构成的，因此它们可以用于靶向表现出有趣磁性的新材料，如自旋阻挫。
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 "CuV2" triangular motifs in the two new compounds [enH(2)]Cu(H2O)(2)[V2O2F8] (1) and [Cu(H2O)(2,2'-bpy)](2)[V2O2F8] (2) (where enH(2) = ethylenediammonium and 2,2'-bpy =2,2'-bipyridyl) reveals that the [VOF4](2-) 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- ligands (i.e., the F- ligand trans to O2- and one equatorial F- ligand) in both 1 and 2 owing to the significant pi-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.