六倍氧协调三重体 (S = 1) (palladium) 部分由三 (bipyridine) (ruthenium) 离子模拟
Fabrice Pointillart1, Cyrille Train, Françoise Villain
1Laboratoire de Chimie Inorganique et Matériaux Moléculaires, UMR CNRS 7071, Université Pierre et Marie Curie-Paris 6, 4 place Jussieu, Case 42, 75252 Paris Cedex 05, France.
Journal of the American Chemical Society
|February 1, 2007
概括
三 (Tris) 双 (Bipyridine) (Ruthenium) 模板制造产生了新的 (Palladium) 氧酸盐网络. 这些材料表现出不寻常的协调和反铁磁相互作用,这对于理解扩展固体中的磁性质至关重要.
科学领域:
- 无机化学 无机化学 有机化学
- 材料科学 材料科学 材料科学
- 固态化学 固态化学
背景情况:
- (II) 复合物是构建协调网络的有效模板剂.
- 基于酸盐的框架提供了多功能结构,用于结合金属离子.
- 了解金属离子协调环境是设计功能材料的关键.
研究的目的:
- 为了描述新型 (((II) 氧酸盐网络的模板合成,使用Tris (((双) ((II).
- 在结构上和磁性上对合成的[Ru(bpy) 3][PdMn(ox) 3化合物进行表征.
- 调查由 ((II) 协调环境产生的电子和磁性质.
主要方法:
- 模板合成使用Tris (二氧化) (II) 作为指导剂.
- 粉末X射线衍射 (PXRD) 用于结构阐明.
- 用X射线吸收光谱 (XAS) 探测局部协调几何.
- 磁力测量 (SQUID) 用于确定磁性属性和相互作用.
- 密度函数理论 (DFT) 用于对模型复杂的计算分析.
主要成果:
- 成功合成了两种基于氧酸盐的新型网络:[Ru(bpy) 3][Pd(2)(ox) 3和[Ru(bpy) 3[PdMn(ox) 3].
- 结构性表征揭示了Pd(II) 异常的6坐标氧环境,具有明显的Pd-O键长度.
- 磁力测量表明Pd (II) 和偏磁中心之间的反铁磁交换相互作用的三重基态.
- 没有观察到长距离的磁性排序,直到2K.
- DFT的计算支持了关于协调和磁交换的实验发现.
结论:
- 二 (Tris) 是一种可行的模板剂,用于创建复杂的3D氧酸盐网络.
- 在Pd(II) 周围的独特协调几何学影响其磁性基本状态.
- 在网络中存在反铁磁相互作用,但不会导致远程磁性秩序.
- 这些发现有助于理解金属有机框架中的结构属性关系.
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