Design and Characterization of Late Transition Metal Complexes and Single-Molecule Magnets

后过渡金属配合物和单分子磁体的设计和表征

• 批准号: 1800578
• 负责人: Stephen Holmes
• 金额: $ 48.5万
• 依托单位: University of Missouri-Saint Louis
• 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: 2018-07-15 至 2022-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1800578&HistoricalAwards=false
• 关键词: Design; Characterization; Late; Transition; Metal

With funding from the Chemical Synthesis Program of the Division of Chemistry , Dr. Stephen M. Holmes of the University of Missouri-St. Louis is developing magnetic molecules to gain a better understanding of how to control magnetism within small particles. Magnetic materials find widespread use in technologically-important devices such as speakers, electrical motors, noise filters, transformers, and information storage media such as magnetic hard drives. In the case of information storage, there is an increasing emphasis on creating smaller magnetic particles to increase data storage density. Unfortunately, smaller magnetic particles often give faster data loss, limiting the usefulness of traditional hard drives. Dr. Holmes is making magnetic molecules to understand how small magnets behave under various conditions. By studying molecular models, he is establishing relationships between temperature, energy changes in the molecule, and motions, with a goal of relating these to their magnetic properties. Dr. Holmes is also actively engaged in outreach activities that encourage elementary, high school, and undergraduate students to be active participants in research and teaching. Dr. Holmes also promotes STEM outreach involving minority, female, and financially disadvantaged students. He currently supports female and minority high school and undergraduate interns and is developing laboratory experiments and STEM activities for the undergraduate laboratories at his university. These research and training activities advance national competitiveness in high tech sectors such as computing and electronics development.Dr. Holmes is developing a better understanding of how small molecules can behave as magnets (single-molecule magnets). He is working to design late transition metal single-molecule magnetic complexes whose vibrational and electronic properties may be systematically tuned. He is working towards establishing relationships between chemical bonding, intermolecular contacts, and molecular and electronic structures. These changes are being probed using various spectroscopic and magnetic measurement techniques to deduce which structural and electronic features are most important in magnetic relaxation. He is devising synthetic approaches for slowing magnetic relaxation, leading to the preparation of materials that perform better at higher temperatures. Dr. Holmes is also developing high school and undergraduate laboratory experiments that are aimed at improving the education. He is partnering with local and national educational outreach programs to engage students from financially disadvantaged, minority-serving, and underperforming school districts in research activities, fostering their continuing interest in STEM-related fields of study.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.

在化学系化学合成项目的资助下，斯蒂芬·M·密苏里大学圣路易斯分校的霍姆斯正在开发磁性分子，以更好地了解如何控制小颗粒内的磁性。磁性材料广泛应用于技术重要的设备，如扬声器，电机，噪音过滤器，变压器和信息存储介质，如磁性硬盘驱动器。在信息存储的情况下，越来越强调创建更小的磁性颗粒以增加数据存储密度。不幸的是，较小的磁性颗粒通常会导致更快的数据丢失，从而限制了传统硬盘的实用性。霍姆斯博士正在制造磁性分子，以了解小磁铁在各种条件下的行为。通过研究分子模型，他正在建立温度，分子能量变化和运动之间的关系，目标是将这些与它们的磁性联系起来。霍姆斯还积极参与外展活动，鼓励小学，高中和本科学生积极参与研究和教学。霍姆斯还促进STEM外展涉及少数民族，女性和经济困难的学生。他目前支持女性和少数民族高中和本科生实习生，并正在为他所在大学的本科生实验室开发实验室实验和STEM活动。 这些研究和培训活动提高了国家在计算和电子开发等高科技领域的竞争力。Holmes博士正在更好地了解小分子如何发挥磁铁的作用（单分子磁铁）。他正致力于设计后过渡金属单分子磁性复合物，其振动和电子特性可以系统地调整。他致力于建立化学键，分子间接触，分子和电子结构之间的关系。这些变化正在使用各种光谱和磁性测量技术来探测，以推断哪些结构和电子特征在磁弛豫中最重要。他正在设计减缓磁弛豫的合成方法，从而制备出在更高温度下性能更好的材料。霍姆斯博士还在开发旨在改善教育的高中和本科实验室实验。他与地方和国家教育推广计划合作，让来自经济困难、少数民族服务和表现不佳学区的学生参与研究活动，培养他们对STEM相关研究领域的持续兴趣。该奖项反映了NSF的法定使命，并通过使用基金会的智力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

Structure-property studies of a new one-dimensional Fe(III)/Mn(II) chain

• DOI: 10.1016/j.poly.2020.114376
• 发表时间: 2020-03
• 期刊: Polyhedron
• 影响因子: 2.6
• 作者: Yuan-Zhu Zhang;N. Rath;J. M. Cain;M. Meisel;S. Holmes

Structure-Property Studies of a New {FeIII2MnII} Complex

• DOI: 10.1016/j.poly.2021.115324
• 发表时间: 2021-06
• 期刊: Polyhedron
• 影响因子: 2.6
• 作者: N. Rath;S. Holmes