The Effect of High Pressure on Single Molecule Magnets

高压对单分子磁体的影响

• 批准号: EP/D503744/1
• 负责人: Simon Parsons
• 金额: $ 69.69万
• 依托单位: University of Edinburgh
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2006
• 资助国家: 英国
• 起止时间: 2006 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FD503744%2F1
• 关键词: Effect; Pressure; Single; Molecule; Magnets

Magnetic materials are used in a broad range of applications, including devices for information storage, in which information is stored by magnetic particles of metal oxide or alloys. There is a drive to make devices with ever-smaller particles in order to increase the amount of information that can be stored on a given size of disk-drive or length of magnetic tape. Certain transition metal complexes exist which consist of a core containing metal ions connected by oxygen and nitrogen atoms derived from ligand molecules. Some of these complexes fall into a class of molecules called Single Molecule Magnets. Single molecule magnets behave as though they are very small fragments of metal oxide encapsulated within a sheath of organic ligands. These fragments are much smaller than the oxide particles currently used in information storage, and therefore they could represent a means of achieving the highest possible density of information storage. Each molecule would represent a single bit of information: one magnetic state might represent a binary 0, the alternative a binary 1.The fundamental properties of single molecule magnets are the subject of intense scientific interest. They are strongly dependent on the nature of the metal ions used to form the complex, the distances between the ions, and the angles subtended at the ligand atoms which link the metal centres together. In previous work, we have shown that interatomic geometry can be altered by applying pressures of 1 - 100 kbar, that is about 1000 to 100 000 times atmospheric pressure. These pressures are achievable by compressing a sample between two diamond anvils in devices which would fit readily into the palm of one's hand. We can also determine the structures of the single molecule magnets by X-ray crystallography, and measure their magnetic properties, while they are at high pressure inside the diamond anvil cell. We can therefore probe, in a very controlled and systematic way, the effect that changes in geometry have on structural and magnetic properties of a given complex.These experiments will be unique, no other collaborative team anywhere has the combined expertise to make single molecule magnets, build suitable high pressure cells and investigate the structures and magnetic properties of the complexes at high pressure. We will begin by investigating the effect of high pressure on some simple complexes and on some well-known single molecule magnets, building up towards investigations of new molecules. The results of this research will not only be of great fundamental interest, enabling changes in magnetic properties to be closely correlated with structural changes, but they may also reveal the structural changes necessary to convert magnetically inactive molecules into single molecule magnets.

磁性材料用于广泛的应用中，包括用于信息存储的装置，其中信息通过金属氧化物或合金的磁性颗粒存储。有一种驱动器，使设备与越来越小的颗粒，以增加的信息量，可以存储在一个给定大小的磁盘驱动器或长度的磁带。存在某些过渡金属络合物，其由含有通过衍生自配体分子的氧和氮原子连接的金属离子的核组成。其中一些复合物属于一类称为单分子磁体的分子。单分子磁体的行为就好像它们是封装在有机配体鞘内的金属氧化物的非常小的碎片。这些碎片比目前用于信息存储的氧化物颗粒小得多，因此它们可以代表实现最高可能密度的信息存储的手段。每个分子都代表一个比特的信息：一个磁状态可能代表二进制0，另一个可能代表二进制1。单分子磁体的基本性质是科学界强烈兴趣的主题。它们强烈地依赖于用于形成络合物的金属离子的性质、离子之间的距离以及将金属中心连接在一起的配体原子所对的角度。在以前的工作中，我们已经表明，原子间的几何形状可以通过施加1 - 100 kbar的压力，即约1000至100 000倍的大气压来改变。这些压力可以通过在两个金刚石砧之间压缩样品来实现，该装置可以容易地放入手掌中。我们还可以通过X射线晶体学确定单分子磁体的结构，并测量它们在金刚石压砧中处于高压下的磁性能。因此，我们可以以一种非常可控和系统化的方式探测几何形状的变化对给定复合物的结构和磁性的影响。这些实验将是独一无二的，任何地方都没有其他合作团队拥有制造单分子磁体的综合专业知识，构建合适的高压电池并研究复合物在高压下的结构和磁性。我们将开始研究高压对一些简单的复合物和一些已知的单分子磁体的影响，并逐步建立对新分子的研究。这项研究的结果不仅具有重大的根本意义，使磁性的变化与结构变化密切相关，而且还可能揭示将磁性惰性分子转化为单分子磁体所需的结构变化。

项目成果

Re-entrant structural phase transition in a frustrated kagome magnet, Rb2SnCu3F12

受挫戈薇磁体 Rb2SnCu3F12 中的重入结构相变

• DOI: 10.1039/c3ce41422a
• 发表时间: 2013
• 期刊: CrystEngComm
• 影响因子: 3.1
• 作者: Downie L

Ultra-low temperature structure determination of a Mn12 single-molecule magnet and the interplay between lattice solvent and structural disorder

Mn12单分子磁体的超低温结构测定以及晶格溶剂与结构无序之间的相互作用

• DOI: 10.1039/c3ce00042g
• 发表时间: 2013
• 期刊: CrystEngComm
• 影响因子: 3.1
• 作者: Farrell A

Magnetic ground state of an experimental S=1/2 kagome antiferromagnet.

• DOI: 10.1103/physrevlett.100.157205
• 发表时间: 2007-05
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: M. A. D. Vries;Konstantin V. Kamenev;W. Kockelmann;Javier Sanchez-Benitez;A. Harrison

Putting the Squeeze on Molecule-Based Magnets: Exploiting Pressure to Develop Magneto-Structural Correlations in Paramagnetic Coordination Compounds

对基于分子的磁体施加压力：利用压力在顺磁配位化合物中发展磁结构相关性

• DOI: 10.3390/magnetochemistry6030032
• 发表时间: 2020
• 期刊: Magnetochemistry
• 影响因子: 2.7
• 作者: Etcheverry-Berrios A