CAREER: Exploiting Novel Architectures for Advanced Heterometallic Magnetic Molecules and Materials

职业：开发先进异金属磁性分子和材料的新颖架构

• 批准号: 1753014
• 负责人: Michael Nippe
• 金额: $ 65万
• 依托单位: Texas A&M University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-06-01 至 2024-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1753014&HistoricalAwards=false
• 关键词: CAREER; Exploiting; Novel; Architectures; Advanced

In this CAREER project, funded by the Chemical Structure, Dynamic & Mechanism B Program of the Chemistry Division, Professor Michael Nippe of the Department of Chemistry at Texas A&M University is developing new classes of heterometallic transition metal-rare earth complexes with interesting magnetic properties. The goal of this research is to exploit various interactions between paramagnetic metal ions to develop new classes of single-molecule magnets (SMMs) that will feature improved performance, higher operating temperatures, and switchable magnetization dynamics. These molecular materials have tremendous potential for next generation data storage and future spintronic devices. This interdisciplinary project combines state-of-the-art techniques from inorganic, synthetic, computational, and physical chemistry to identify important fundamental design guidelines for novel SMM systems. The project is very well suited to holistically educate future scientists at all levels. This project also involves the creation and development of new class modules at the highest level of education. Several outreach activities to high schools featuring underrepresented students in sciences are also part of the project. Interactions of lanthanide (Ln) atoms with transition metal (TM) atoms result in hard bulk magnetic materials. Highly magnetic anisotropic Ln3+ ions are also commonly exploited for the study of slow magnetic relaxation in SMMs, which have attracted increased attention due to their potential application in information storage and spintronic devices. SMMs are characterized by a thermal energy barrier to magnetization reversal. However, only very limited information about the magnetic properties of molecular materials featuring direct Ln-TM bonds have been reported. Furthermore, Ln-TM bonded complexes are rare and fundamental questions concerning the nature of the bonding remain open. This project addresses these questions with the specific goal to develop next-generation SMMs. Synthetic strategies to access and study molecules that feature (1) direct Ln-TM bonds or (2) Ln···TM interactions will be developed. Focus is given to the study of magnetic properties at various timescales of these heterometallic Ln/TM complexes.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在这个由化学系化学结构，动力学机制B计划资助的CAREER项目中，德克萨斯州A M大学化学系的Michael Nippe教授正在开发具有有趣磁性的新型异金属过渡金属-稀土配合物。 这项研究的目标是利用顺磁性金属离子之间的各种相互作用来开发新型单分子磁体（SMM），这些磁体将具有更高的性能，更高的工作温度和可切换的磁化动力学。 这些分子材料在下一代数据存储和未来的自旋电子器件方面具有巨大的潜力。 这个跨学科的项目结合了无机，合成，计算和物理化学的最新技术，以确定新型SMM系统的重要基本设计准则。该项目非常适合全面教育各级未来的科学家。 该项目还涉及在最高教育水平创建和开发新的班级模块。针对理科学生人数不足的高中开展的几项外联活动也是该项目的一部分。镧系元素（Ln）原子与过渡金属（TM）原子的相互作用导致硬块状磁性材料。高磁各向异性的Ln 3+离子也常用于研究SMM中的慢磁弛豫，由于其在信息存储和自旋电子器件中的潜在应用，其引起了越来越多的关注。SMM的特征在于对磁化反转的热能势垒。然而，只有非常有限的信息，具有直接的Ln-TM键的分子材料的磁性已被报道。此外，Ln-TM键合配合物是罕见的，有关键合性质的基本问题仍然是开放的。该项目解决了这些问题，具体目标是开发下一代SMM。将开发用于访问和研究具有（1）直接Ln-TM键或（2）Ln···TM相互作用的分子的合成策略。重点是这些异质金属Ln/TM复合物在不同时间尺度下的磁性研究。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

A High-Performance Single-Molecule Magnet Utilizing Dianionic Aminoborolide Ligands

• DOI: 10.1021/jacs.2c06698
• 发表时间: 2022-09-26
• 期刊: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
• 影响因子: 15
• 作者: Vanjak, James C.;Wilkins, Branford O.;Nippe, Michael
• 通讯作者: Nippe, Michael