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EPR characterization of molecular magneto-structural correlations under pressure

压力下分子磁结构相关性的 EPR 表征

基本信息

批准号：
EP/H004106/1
负责人：
Euan Brechin
金额：
$ 55.31万
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：
2009
资助国家：
英国
起止时间：
2009 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FH004106%2F1
关键词：
EPR characterization molecular magneto structural

项目摘要

Molecular magnetism represents a multidisciplinary research field focused on the employment of molecular approaches to design, create, study and use new classes of magnetic materials in which properties can be tuned at the molecular level. This project will examine the effects of pressure on molecular clusters (molecular nanomagnets) ranging from simple monomers and dimers, to complex polymetallic molecules. The use of pressure offers the potential to provide detailed information concerning the relationship between structure and magnetic properties within the same molecule, i.e. how do changes in bond lengths and angles change the way unpaired electrons on neighbouring metal ions communicate with each other? To date the only published studies of polymetallic systems under pressure involve the prototype single-molecule magnet (SMM) [Mn12], a [Mn4] cubane, and a hexametallic [Mn6]-oxime complex made by us. Although clear changes in magnetic properties are observed in all cases, the proposed explanations for the former two are somewhat speculative since they do not involve structural studies. The Edinburgh group were the first to combine high pressure magnetometry and crystallography, establishing clear magneto-structural correlations (MSCs) as a function of pressure for one member of the Mn6 family.This project aims to combine these world-leading structural and magnetic characterization techniques with (for the very first time) high pressure High-Frequency Electron Paramagnetic Resonance (HFEPR), a technique developed at the NHMFL in Tallahassee, to afford unprecedented and detailed insight into the structure-property relationship of paramagnetic materials.

分子磁学是一个多学科的研究领域，专注于采用分子方法来设计，创造，研究和使用新的磁性材料，其中性能可以在分子水平上进行调整。本项目将研究压力对分子簇（分子纳米磁体）的影响，范围从简单的单体和二聚体到复杂的多金属分子。压力的使用提供了提供有关同一分子内结构和磁性之间关系的详细信息的可能性，即键长和角度的变化如何改变相邻金属离子上未成对电子彼此通信的方式？到目前为止，在压力下的多金属系统的唯一已发表的研究涉及原型单分子磁体（SMM）[Mn 12]，[Mn 4]立方烷，和六金属[Mn 6]-肟配合物由我们制作。虽然在所有情况下都观察到磁性的明显变化，但对前两种情况提出的解释有些推测性，因为它们不涉及结构研究。Edinburgh团队率先将联合收割机高压磁力学和晶体学相结合，为Mn 6家族的一个成员建立了清晰的磁结构相关性（MSC），作为压力的函数。该项目旨在将这些世界领先的结构和磁性表征技术与联合收割机相结合，（首次）高压高频电子顺磁共振（HFEPR），一种在塔拉哈西的NHMFL开发的技术，提供了前所未有的和详细的洞察顺磁性材料的结构-性能关系。