Magnetic properties of large paramagnetic polyoxometalates: magnetochemical and magnetic resonance spectroscopy

大型顺磁性多金属氧酸盐的磁性：磁化学和磁共振波谱

• 批准号: 5370053
• 负责人: Professor Dr. Martin Dressel
• 金额: --
• 依托单位: 1. Physikalisches Institut
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5370053?language=en
• 关键词: Magnetic; properties; large; paramagnetic; polyoxometalates

In their higher oxidation state the elements of the subgroups V and VI have the tendency to form polynuclear, anionic metal-oxygen clusters which are unsurpassed in their topological and electronic diversity. These clusters may serve as ideal objects to study the development and the properties of nanostructured systems. Of paramount interest in this regard are the giant but discrete clusters we recently succeeded to isolate. Some properties which may be observed in these nanostructured particles are based on effects which are at present only known from extended solids. In this context we intend to investigate the spin organization of those clusters in detail, including the related magnetism and magnetic ordering. Using a new high-frequency method (worldwide accessible to only three groups) the energy levels, the exchange and hyperfine interactions, and the crystal fields shall be directly determined, and how they are influenced by the environment, defects, etc.

在其较高的氧化态下，V和VI亚族的元素有形成多核阴离子金属氧簇的趋势，其拓扑和电子多样性是无与伦比的。这些团簇可以作为研究纳米结构体系发展和性质的理想对象。在这方面最感兴趣的是我们最近成功地分离出的巨大但离散的星系团。在这些纳米结构颗粒中可以观察到的一些特性是基于目前仅从延伸的固体中知道的效应。在此背景下，我们打算详细地研究这些团簇的自旋组织，包括相关的磁性和磁性有序。使用一种新的高频方法(全球范围内只有三个小组可以访问)，将直接确定能级、交换和超精细相互作用、晶场，以及它们如何受到环境、缺陷等的影响。