异常立体,三维桥梁三角/五角层结构的人造反铁磁铁为普鲁士蓝模拟A3MnII5(CN) 13 (A = NMe4,NETMe3). 一个离子适应结构
Saul H Lapidus1, Adora G Graham2, Christopher M Kareis2
1Department of Physics & Astronomy , State University of New York , Stony Brook , New York 11794-3800 , United States.
Journal of the American Chemical Society
|December 18, 2018
概括
有机阴离子的大小控制了普鲁士蓝类似物 (PBA) 的结构和组成. 这些适应性PBA形成具有可调节性质的新型反铁磁材料.
科学领域:
- 材料科学
- 无机化学
- 固态化学
背景情况:
- 混合有机/无机普鲁士蓝色类似物 (PBA) 的结构和特性各异.
- PBA,AaMnIIb(CN) a+2b的体质受有机阴离子 (A) 的影响.
- 性PBA通常具有M和M'八面协调位的立方结构.
研究的目的:
- 调查阴子适应性PBA中的结构属性关系.
- 合成和表征新的PBA化合物,
- 探索这些材料的磁性特性,特别是它们的反铁磁性排序.
主要方法:
- 乙酸与有机化物 (A+CN-,其中A=NMe4,NEtMe3) 的反应.
- 进行X射线衍射和晶体分析以确定三维结构.
- 对磁性敏感度进行测量,以调查磁性排序.
主要成果:
- 一种具有复杂3D结构的水合物质A3MnII5(CN) 13的形成.
- 对八面体,方形金字塔和三角形双金字塔 MnII位点的观察.
- (NMe4)3MnII5(CN)13由于桥接层,在11K时表现出反铁磁排序.
- 发现了一系列具有独特结构的随机相关的PBA (AaMnIIb(CN) a+2b).
- 将不寻常的结构归因于MnII的离子性质,并最大限度地减少空隙.
结论:
- 有机的尺寸和形状对于决定PBA固态度和结构至关重要.
- 这些离子适应性PBA代表了罕见的内在,化学制备的人造反铁磁体的例子.
- 这些材料层间的控制间隔为潜在的应用提供了优势.
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