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Molecular Magnets: From Cages to Supramolecular Assemblies

分子磁体：从笼到超分子组件

基本信息

批准号：
EP/L010615/1
负责人：
Euan Brechin
金额：
$ 41.95万
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：
2013
资助国家：
英国
起止时间：
2013 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FL010615%2F1
关键词：
Molecular Magnets Cages Supramolecular Assemblies

项目摘要

Magnetic Materials are employed in an enormous range of applications in modern society, from information storage in computers, refrigeration in security and astronomical instrumentation, biocompatible agents for use as both contrast and polarizing agents in magnetic resonance imaging (MRI) and diagnosis, and as agents for magnetic hyperthermic treatments. Academically, molecule-based magnets are also studied intensively with regard to their important fundamental chemistry and physics, since they have the potential to be exploited in nanoscale electronics devices, as beautifully demonstrated recently by the construction of single-molecule spintronic devices (spin valves and transistors). Molecule-based materials offer the great advantage of being designable and manipulable by synthetic chemistry. That is, they can be constructed atom by atom, molecule by molecule with the unparalled advantages of being soluble, monodisperse in size, shape and physical properties, and tuneable at the atomic scale. Indeed, this "bottom-up" research vision is not restricted to academia - IBM recently reported information storage in surface-isolated (2x6) arrays of Fe atoms at liquid He temperatures and are actively investigating spintronics and data storage with a view to the ultimate miniaturisation of such technologies. However, before any molecule or molecule-based material can have commercial application or value, the fundamental and intrinsic relationship between structure and magnetic behaviour must be understood. This requires the chemist to design and construct familes of related complexes, characterise them structurally and magnetically, and through extensive collaboration with a network of world-class condensed matter physicists and theoreticians, understand their underlying physical properties. The current proposal directly addresses these fundamental questions through the controlled aggregation and organisation of molecular magnets into designed 0-3D architectures in the solid state. Specifically it applies the fundamental principles underpinning supramolecular chemistry to assemble single-molecule magnets into novel topologies by taking advantage of simple coordination-driven self-assembly processes. We will employ molecular magnets as building blocks for the formation of supramolecular assemblies and coordination polymers in which the spin dynamics of the molecular building blocks are modulated through the attachment of, and interaction with, other paramagnetic moieties. In order to achieve this we will: design and build a range of metalloligands, ranging from simple isotropic molecules to more complex and exotic anisotropic molecules and attach them to pre-made SMMs; construct hybrid magnetic materials from SMMs and cyanometalate building blocks; design and synthesise dual-functioning ligands which are capable of directing the formation of SMMs and simultaneously linking them into higher order (O-3D) materials; and characterise all materials, structurally and magnetically, through a battery of techniques.

磁性材料在现代社会中的应用范围非常广泛，从计算机中的信息存储、安全和天文仪器中的制冷、作为磁共振成像(MRI)和诊断中的对比剂和偏振剂的生物相容试剂，以及作为磁热治疗的试剂。在学术上，分子磁体在其重要的基础化学和物理方面也得到了深入的研究，因为它们具有在纳米电子设备中开发的潜力，最近单分子自旋电子器件(自旋阀和晶体管)的构造就很好地证明了这一点。以分子为基础的材料具有可设计和可通过合成化学操作的巨大优势。也就是说，它们可以一个原子一个分子地构建，具有无与伦比的优势，即在大小、形状和物理性质上都是单分散的，并且在原子尺度上是可调节的。事实上，这种自下而上的研究愿景并不局限于学术界--IBM最近报告称，在液态氦温度下，信息存储在表面隔离(2x6)的铁原子阵列中，并正在积极研究自旋电子学和数据存储，以期最终实现此类技术的微型化。然而，在任何分子或基于分子的材料能够具有商业应用或价值之前，必须了解结构和磁性行为之间的基本和内在关系。这需要化学家设计和构建一系列相关的络合物，从结构和磁性上对它们进行表征，并通过与世界级凝聚态物理学家和理论家网络的广泛合作，了解它们的基本物理性质。目前的方案通过控制分子磁体的聚集和组织成固态中设计的0-3D结构，直接解决了这些基本问题。具体地说，它应用超分子化学的基本原理，通过简单的配位驱动自组装过程将单分子磁体组装成新的拓扑结构。我们将使用分子磁体作为超分子组装和配位聚合物的构建块，其中分子构建块的自旋动力学通过与其他顺磁性部分的附着和相互作用来调节。为了实现这一目标，我们将：设计和制造一系列金属配体，从简单的各向同性分子到更复杂和奇异的各向异性分子，并将它们连接到预制的SMM上；由SMM和氰基金属酸盐构建杂化磁性材料；设计和合成能够指导SMM形成并同时将它们连接成更高阶(O-3D)材料的双功能配体；以及通过一系列技术表征所有材料的结构和磁性。