CAREER: Synthesis and Studies of One-Dimensional Magnets Supported by Bulky, Redox-Active Benzoquinonoid Bridging Ligands

技术概述：在材料研究部固态和材料化学项目的支持下，该项目将采用配位化学方法(1)合成新型一维配位磁铁或单链磁铁（scm），这些磁铁表现出前所未有的强度磁耦合；(2)开展基础研究，以更好地了解如何控制这些材料中的自旋松弛势垒。这两个目标将并行进行，每一个目标的结果将有助于通知另一个目标的下一步行动。更具体地说，本研究计划旨在合成和研究由氧化还原活性苯并醌类配体连接的高自旋、高磁性各向异性金属离子组成的scm。在这些桥接配体上产生和稳定不成对电子的能力将导致配体和沿链的金属基自旋载流子之间产生极强的磁耦合相互作用。这些相互作用与金属离子的磁性各向异性相结合，将导致链式化合物在前所未有的高温下表现出经典的类磁铁行为。在这项工作过程中合成和研究的化合物可能会在高密度、基于自旋的信息存储和处理、量子计算和自旋电子学等实际应用中找到实用价值。非技术总结：新型磁性材料的设计和理解对社会来说比以往任何时候都更加重要。这些材料是数据存储和处理技术的基础，对更高效设备的需求正在迅速增长。事实上，当前数据中心的需求，如电力消耗和冷却技术，是不可持续的。解决这些问题需要基础科学研究，重点是开发基于磁体的数据存储和操作材料的新范例。其中一项研究集中于创造新的一维磁性材料，这也是本提案的主题。在这里，设计、理解和最终实现一维材料的能力将使当前基于三维材料的技术在存储容量方面取得巨大进步。此外，该提案的教育计划将在一个经常被剥夺科学教育但渴望学习更多知识的群体中建立基础分子磁学与现实世界应用之间的联系：老年人。将教育和研究计划结合起来，不仅可以让老年人了解磁性材料的奇迹和社会重要性，还可以向他们证明，当今世界对科学创新和发现的需求比以往任何时候都更加迫切。

TECHNICAL SUMMARY: With support from the Solid State and Materials Chemistry program in the Division of Materials Research, this project will employ coordination chemistry approaches to (1) synthesize new classes of one-dimensional coordination magnets, or single-chain magnets (SCMs), that exhibit magnetic coupling of unprecedented strength and to (2) carry out fundamental studies to better understand how to control spin relaxation barrier in these materials. These two objectives will be pursued in parallel, with results from each helping to inform the next steps of the other. More specifically, this research plan sets out to synthesize and study SCMs comprised of high-spin, high-magnetic anisotropy metal ions connected by redox-active benzoquinonoid ligands. The ability to engender and stabilize unpaired electrons on these bridging ligands will lead to extremely strong magnetic coupling interactions between ligand- and metal-based spin carriers along the chain. These interactions, in conjunction with magnetic anisotropy of the metal ions, will lead to chain compounds that exhibit classical magnet-like behavior at unprecedented high temperatures. Compounds such as those synthesized and studied during the course of this work may find utility in practical applications such as high-density, spin-based information storage and processing, quantum computing, and spintronics.NON-TECHNICAL SUMMARY: The design and understanding of new magnetic materials is more important to society than ever before. These materials are the foundation of data storage and processing technology, and the demand for more efficient devices is rapidly growing. Indeed, the requirements of current data centers, such as electricity consumption and cooling technology, are not sustainable. Addressing these problems requires fundamental scientific research focused on the development of new paradigms for materials in magnet-based data storage and manipulation. One such line of research focuses on the creation of new one-dimensional magnetic materials, the topic of this proposal. Here, the ability to design, understand, and ultimately implement one-dimensional materials will enable dramatic advances in storage capacity over the current three-dimensional material-based technology. In addition, the education plan of this proposal will establish connections between fundamental molecular magnetism and real world applications in a group who is often deprived of science education yet hungry to learn more: older adults. Integrating the education and research plans will not only educate older adults about the wonders and societal importance of magnetic materials, but it will also demonstrate to them that the need for scientific innovation and discovery in today's world is more critical than ever before.