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.

磁性材料用于现代社会的大量应用中，从计算机中的信息存储，安全性和天文仪器的制冷，生物相容性剂用作磁共振成像（MRI）中的对比度和极化剂，以及作为磁性高温处理的电剂。从学术上讲，基于分子的磁铁也对其重要的基本化学和物理学进行了深入的研究，因为它们有可能在纳米级电子设备中进行利用，这是通过构建单分子旋转器设备（自旋阀和晶体管）的构建，这很好地证明了它们。基于分子的材料可通过合成化学可设计和操纵。也就是说，它们可以通过原子来构造原子，分子通过分子具有可溶性，大小，形状和物理特性的无均值优势，并且在原子尺度上可调。确实，这种“自下而上”的研究视觉不仅限于学术界-IBM最近报道了在液体HE温度下表面隔离（2x6）Fe原子阵列中的信息存储，并正在积极研究纺纱和数据存储，以期最终的微型化。但是，在任何基于分子或分子的材料都可以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关系和内在关系。这要求化学家设计和构建相关络合物的家族，在结构和磁性上对它们进行特征，并通过与世界一流的凝结物质物理学家和理论家网络进行广泛的合作，了解其潜在的物理特性。当前的提案通过将分子磁体的控制和组织组织成固态的0-3D体系结构直接解决这些基本问题。具体而言，它通过利用简单的协调驱动的自组装过程，将基础化学基础的基本原理应用于新拓扑中，将单分子磁体组装到新型拓扑中。我们将采用分子磁铁作为形成超分子组件和协调聚合物的构建基块，其中通过附着和与其他顺磁因子的附着和相互作用来调节分子构建块的自旋动力学。为了实现这一目标，我们将：设计和构建一系列金属物，从简单的各向同性分子到更复杂和更外来的各向异性分子，并将它们连接到预制的SMMS上；从SMM和氰酸酯构建块中构建混合磁性材料；设计和综合双功能配体能够指导SMM的形成并同时将其连接到高阶（O-3D）材料中；并通过一系列技术在结构和磁性上表征所有材料。