RUI: Linear trimers of Fe, Co, and Ni with unique structural, magnetic, and electrochemical properties

该项目由美国国家科学基金会化学部的化学合成计划资助。南乔治亚大学阿姆斯特朗校区的加里·吉利特博士研究了合成含有三个金属离子和两个金属-金属键的化合物的策略，这些化合物的原子和键是线性排列的。金属-金属键的研究是一个密集的研究领域，因为含有这种键的化合物具有独特的性质。虽然有许多包含两个金属离子之间具有金属-金属键的化合物的例子，但包含大量具有金属-金属键的金属的化合物很少。更罕见的是具有串联的金属-金属键的化合物。Guillet博士研究了影响键合强度的因素，以及化合物的物理性质和反应性。这大大增加了对多金属化合物中金属-金属键的理解，并影响了分子线设计等领域。阿姆斯特朗校区的学生群体是多样化的，许多学生是在化学科学方面代表性不足的少数族裔。大约37%的化学和生物化学专业的学生是第一代大学生。为了缩小科学、技术、工程和数学方面的教育差距，扩大学生获得研究经验的渠道至关重要。机构数据清楚地表明，与同龄人相比，参加本科研究的学生毕业得更快。在这笔赠款的资助下，Guillet博士正在指导和促进这些学生。过渡金属的双金属络合物得到了丰富和深入的研究。然而，通过添加第三种金属形成线性三金属配合物来扩展这些化合物在合成上是具有挑战性的，而且这些配合物很少。存在的大多数三金属络合物的例子都是由配体联吡啶胺支撑的。为了研究这些扩展体系的性质，需要新的三金属络合物，为此需要新的配体。Guillet博士正在研究一种新型配体家族的合成，该家族旨在支持铁、钴和镍的三金属络合物。用多核核磁共振、X-射线衍射法、紫外-可见光谱和红外光谱对这些配合物的物理性质进行了研究。Guillet博士还在使用电化学和人工合成的氧化还原反应来研究这种反应性。该项目的工作是扩大对支持三金属络合物所需的配体特征的理解，并阐明金属-金属通信的特征。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。

This project is funded by the Chemical Synthesis Program in the NSF Chemistry Division. Dr. Gary Guillet of Georgia Southern University's Armstrong Campus investigates strategies to synthesize compounds containing three metal ions and two metal-metal bonds with the atoms and bonds arranged linearly. The study of metal-metal bonding is an area of intense research because of the unique properties of compounds that contain this type of bond. While there are many examples of compounds that contain two metal ions with a metal-metal bond between them, there is a dearth of compounds containing a larger number of metals with metal-metal bonding. Even more rare are compounds with metal-metal bonds that are linked in series. Dr. Guillet investigates the factors that affect the strength of the bonding, and the physical properties and reactivity of the compounds. This adds significantly to the understanding of metal-metal bonding within multi-metallic compounds and impacts fields such as molecular wire design. The student body of the Armstrong campus is diverse group and many students are minorities underrepresented in the chemical sciences. About 37% of the chemistry and biochemistry majors are first generation college students. In order to close the education gap in science, technology, engineering, and mathematics, it is critical to expand access to research experiences for students. Institutional data clearly shows that students graduate faster if they participate in undergraduate research compared to their peers. With funding from this grant, Dr. Guillet is mentoring and promoting these students.Dimetallic complexes of transition metals are abundant and thoroughly studied. However, extending these compounds by addition of a third metal forming linear, trimetallic, complexes is synthetically challenging and there is a dearth of these complexes. Most examples that exist of trimetallic complexes are supported using the ligand dipyridylamine. Novel trimetallic complexes are required to study the properties of these extended systems and new ligands are needed for this purpose. Dr. Guillet is investigating the synthesis of a novel ligand family designed to support trimetallic complexes of Fe, Co, and Ni. The physical properties of these complexes are being examined using multinuclear NMR, X-ray diffractometry, UV-Vis spectroscopy, and IR spectroscopy. Dr. Guillet is also investigating the reactivity using electrochemistry as well as synthetic redox reactions. Work on this project is expanding the understanding of ligand characteristics necessary to support trimetallic complexes and elucidate the characteristics of metal-metal communication.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.