Molecular Magnets of Re(IV)

磁铁在现代社会中无处不在，从生物医学成像和癌症治疗到信息技术、国家和国际防务与安全以及外层空间研究，磁铁的应用范围非常广泛。在工业和学术领域，现代研究的主要目标之一就是使这些技术小型化。这完全依赖于基础科学研究，以及对结构和磁性行为之间内在关系的调查和理解。这需要化学家设计和构建分子和分子基材料家族，并通过与凝聚态物理学家，理论家和材料科学家的广泛合作，了解并最终利用其潜在的物理特性。最近，Wernsdorfer和他的同事构建了单分子自旋阀和晶体管，ibm报告了铁原子表面阵列中的信息存储，这些都很好地证明了这一点。分子磁学的学术领域代表了一个原子一个原子，一个分子一个分子的方法来构建新的磁性材料。分子或“自下而上”的方法比“自上而下”的方法有许多潜在的优势：分子是可溶的，在大小和形状上是单分散的，可以通过简单的合成化学来改变，产生具有可调的，设计的，物理性质的材料。本提案首先关注基于高各向异性4/5d离子的单核配合物库的合成、结构和磁性表征。然后，这些配合物被用作3d金属离子或配合物的金属配体，有望为构建具有可预测结构和可调谐磁性行为的预先设计的金属笼提供合理的途径。它还涉及到各向异性金属配体附着在众所周知的和表征良好的预制分子磁体上，如Co4， Mn6, Ni12, Fe17，以检查对磁化弛豫动力学的影响，并推导出详细的磁结构相关性。

Magnets are ubiquitous in modern society, employed in an enormous range of applications from biomedical imaging and cancer therapy to information technology, national and international defence and security, and outer-space research. One of the main goals of modern research, in both the industrial and academic sectors, is the miniaturisation of such technologies. This is entirely reliant upon fundamental scientific research, and the investigation and understanding of the intrinsic relationship between structure and magnetic behaviour. This requires chemists to design and build families of molecules and molecule-based materials, and through extensive collaboration with a network of condensed matter physicists, theoreticians and materials scientists, understand and ultimately exploit their underlying physical properties. This was demonstrated beautifully with the recent construction of single-molecule spin valves and transistors by Wernsdorfer and co-workers, and through IBMs report of information storage in surface arrays of Fe atoms. The academic field of molecular magnetism represents an atom-by-atom, molecule-by-molecule approach to building new magnetic materials. The molecular or "bottom-up" approach has many potential advantages over the "top-down" approach: molecules are soluble, monodisperse in size and shape, amenable to change through simple synthetic chemistry generating materials with tuneable, designer, physical properties. This proposal first concerns the synthesis, structural and magnetic characterisation of a library of mononuclear complexes based on highly anisotropic 4/5d ions. These complexes are then used as metalloligands towards 3d metal ions or complexes, promising a rational route toward the construction of pre-designed metal cages with predictable structures and tuneable magnetic behaviour. It also involves the attachment of anisotropic metalloligands to well-known and well characterised, pre-made molecular magnets, such as Co4, Mn6, Ni12, Fe17, in order to examine the effect on magnetisation relaxation dynamics and to derive detailed magneto-structural correlations.