模板合成和单分子磁性特性的复杂的旋转S = 16和一个[Mn8O8]8+式核心
Anastasios J Tasiopoulos1, Wolfgang Wernsdorfer, Brian Moulton
1Department of Chemistry, University of Florida, Gainesville, FL 32611-7200, USA.
Journal of the American Chemical Society
|December 11, 2003
概括
研究人员合成了一种新的-化合物,实现了集群的最高旋转 (S=16). 这一突破使其成为迄今为止发现的最高自旋单分子磁铁 (SMM).
科学领域:
- 无机化学 无机化学
- 材料科学 材料科学 材料科学
- 磁力学 磁力学 是一种
背景情况:
- -氧气集群因其磁性特性而引起人们的兴趣.
- 单分子磁铁 (SMM) 需要高自旋状态来实现潜在的应用.
研究的目的:
- 为了合成和表征一种新的Ce-Mn集群化合物.
- 为了研究新化合物的磁性和旋转基本状态.
- 为了确定该化合物是否表现出单分子磁铁行为.
主要方法:
- 使用链聚合物 {[MnIII(OH) ((O2CMe) ]2 的模板合成. (MeCO2H) 的意思. (H2O) n 和CeIV).
- 单晶X射线衍射用于结构确定.
- 磁化和磁性易感性研究,以探测磁性行为.
主要成果:
- 一个新的化合物[CeIVMnIII8O8(O2CMe) 12(H2O) 4].4H2O (1.4H2O) 已成功合成.
- 该结构具有一个MnIII8循环,封装了一个Ce(IV) 离子.
- 磁性研究显示,一个Mn星团的S=16是创纪录的高自旋地面状态.
- 该化合物表现出缓慢的磁化放松和歇斯底里,这是SMM的特征.
结论:
- 合成的Ce-Mn集群代表了报告的最高自旋集群.
- 这种化合物是迄今为止发现的最高自旋单分子磁铁 (SMM).
- 这些发现为设计具有潜在技术应用的高旋转SMM开辟了新的途径.
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