Extending the Family of V(4+) S=(1/2) Kagome Antiferromagnets.
Extending the Family of V(4+) S=(1/2) Kagome Antiferromagnets.
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DOI：
10.1002/anie.201506869
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发表时间：
2015-10
影响因子：
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通讯作者：
L. Clark;F. Aidoudi;C. Black;K. Arachchige;A. Slawin;R. Morris;P. Lightfoot
中科院分区：
文献类型：
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作者：
L. Clark;F. Aidoudi;C. Black;K. Arachchige;A. Slawin;R. Morris;P. Lightfoot
介绍了新型无机-有机杂化材料咪唑钒(III,IV)氟氧化物[C3 H5 N2 ][V9 O6 F24 (H2 O)2 ] (ImVOF)的离子热合成、结构和磁化率。该结构由无机氟氧化钒板组成，其具有由混合价层分隔的 V(4+) S=${{ 1/2 }}$ 离子的 kagome 层。这些无机板插有咪唑鎓阳离子。奎宁环 (Q) 和吡嗪 (Pyz) 阳离子也可以掺入混合结构类型中，分别得到 QVOF 和 PyzVOF 类似物。无机板的高度受挫拓扑结构以及与 V(4+) 相关的磁性的量子性质意味着这些材料是承载奇异磁性基态（例如备受追捧的量子自旋液体）的绝佳候选材料。所有样品的磁化率测量表明，尽管存在相当大的反铁磁交换，但不存在低至 2 K 的常规长程磁序。
The ionothermal synthesis, structure, and magnetic susceptibility of a novel inorganic-organic hybrid material, imidazolium vanadium(III,IV) oxyfluoride [C3 H5 N2 ][V9 O6 F24 (H2 O)2 ] (ImVOF) are presented. The structure consists of inorganic vanadium oxyfluoride slabs with kagome layers of V(4+) S=${{ 1/2 }}$ ions separated by a mixed valence layer. These inorganic slabs are intercalated with imidazolium cations. Quinuclidinium (Q) and pyrazinium (Pyz) cations can also be incorporated into the hybrid structure type to give QVOF and PyzVOF analogues, respectively. The highly frustrated topology of the inorganic slabs, along with the quantum nature of the magnetism associated with V(4+) , means that these materials are excellent candidates to host exotic magnetic ground states, such as the highly sought quantum spin liquid. Magnetic susceptibility measurements of all samples suggest an absence of conventional long-range magnetic order down to 2 K despite considerable antiferromagnetic exchange.