The rise of 3-d single-ion magnets in molecular magnetism: towards materials from molecules?
The rise of 3-d single-ion magnets in molecular magnetism: towards materials from molecules?
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DOI：
10.1039/c5sc03224e
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发表时间：
2016-04-21
期刊：
影响因子：
8.4
通讯作者：
Murugesu M
中科院分区：
文献类型：
--
作者：
Frost JM;Harriman KLM;Murugesu M
包含一个自旋中心的单分子磁体（SMM）（所谓的单离子磁体）理论上代表了基于自旋的电子器件的最小可能单元。这些分子有望彻底改变计算，改变我们存储、使用和处理信息的方法。包含一个自旋中心的单分子磁体（SMM）（所谓的单离子磁体）理论上代表了基于自旋的电子器件的最小可能单元。这一技术和相关技术的实现首先取决于能够设计具有足够大的磁化反转能垒Ueff的系统，其次取决于能够将这些分子组织成可寻址阵列。近年来，已经朝着前一个目标取得了重大进展-主要是由于已经致力于研究基于高度各向异性镧系离子（例如Tb（iii）和Dy（iii））的络合物的努力。然而，自2013年以来，以及Long及其同事关于线性Fe（i）系统表现出Ueff = 325 K的显着报告，过渡金属的单离子系统在文献中经历了一些复兴。他们不仅有重要的经验教训，教我们关于各向异性和弛豫动力学在寻求提高Ueff，创造强耦合自旋系统的能力可能提供了一个整体的主机1，2和3维材料与有趣的结构和物理特性。这种观点总结了最近的进展，在这个迅速扩大的子流派的分子磁性从合成化学家的角度来看，特别关注的教训，迄今为止已经从单离子磁体的d块，和，未来的研究方向，我们认为可能会出现在未来几年。
Single-molecule magnets (SMMs) that contain one spin centre (so-called single-ion magnets) theoretically represent the smallest possible unit for spin-based electronic devices. These molecules hold the promise to revolutionize computing and change the methodology by which we store, employ and process information. Single-molecule magnets (SMMs) that contain one spin centre (so-called single-ion magnets) theoretically represent the smallest possible unit for spin-based electronic devices. The realisation of this and related technologies, depends on first being able to design systems with sufficiently large energy barriers to magnetisation reversal, Ueff, and secondly, on being able to organise these molecules into addressable arrays. In recent years, significant progress has been made towards the former goal – principally as a result of efforts which have been directed towards studying complexes based on highly anisotropic lanthanide ions, such as Tb(iii) and Dy(iii). Since 2013 however, and the remarkable report by Long and co-workers of a linear Fe(i) system exhibiting Ueff = 325 K, single-ion systems of transition metals have undergone something of a renaissance in the literature. Not only do they have important lessons to teach us about anisotropy and relaxation dynamics in the quest to enhance Ueff, the ability to create strongly coupled spin systems potentially offers access to a whole of host of 1, 2 and 3-dimensional materials with interesting structural and physical properties. This perspective summarises recent progress in this rapidly expanding sub-genre of molecular magnetism from the viewpoint of the synthetic chemist, with a particular focus on the lessons that have so far been learned from single-ion magnets of the d-block, and, the future research directions which we feel are likely to emerge in the coming years.