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，该项目将利用配位化学方法(1)合成具有前所未有的磁耦合强度的新型一维配位磁体或单链磁体(SCM)，以及(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弛豫势垒。这两个目标将同时实现，每个目标的结果都有助于为另一个目标的下一步工作提供信息。更具体地说，这项研究计划致力于合成和研究由高自旋、高磁各向异性的金属离子组成的SCM，这些金属离子通过氧化还原活性的苯醌配体连接起来。在这些桥联配体上产生和稳定未配对电子的能力将导致配体和金属基自旋载流子之间沿着链的极强的磁耦合相互作用。这些相互作用，再加上金属离子的磁各向异性，将导致链状化合物在前所未有的高温下表现出经典的磁体行为。在这项工作中合成和研究的化合物可能会在实际应用中得到应用，如高密度、基于自旋的信息存储和处理、量子计算和自旋电子学。非技术摘要：新磁性材料的设计和理解对社会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，当前数据中心的要求，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，重点是开发磁基数据存储和操作中材料的新范例。其中一项研究集中在创造新的一维磁性材料上，这是这项提议的主题。在这里，设计、理解并最终实现一维材料的能力将使存储容量比目前基于三维材料的技术有显著的进步。此外，这项提案的教育计划将在基础分子磁学和现实世界应用之间建立联系，这一群体往往被剥夺了科学教育，但渴望了解更多知识：老年人。整合教育和研究计划不仅将教育老年人了解磁性材料的奇妙之处和社会重要性，还将向他们表明，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重要。

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.