Chemical, Electrochemical and Physical Properties of Metallosupramolecular Architectures with Tetrazine Based Ligands Including Investigations of Anion-pi Interactions

具有四嗪基配体的金属超分子结构的化学、电化学和物理性质，包括阴离子-pi 相互作用的研究

• 批准号: 1310574
• 负责人: Kim Dunbar
• 金额: $ 46.5万
• 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: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1310574&HistoricalAwards=false
• 关键词: Chemical; Electrochemical; Physical; Properties; Metallosupramolecular

In this project funded by the Macromolecular, Supramolecular and Nanochemistry Program of the Chemistry Division, Kim Dunbar of the Texas A&M University will study various aspects of anion-pi interactions: anion interactions with aromatic molecules. The goals are to study metal complexes with ligands containing electropositive tetrazine rings that form unusual molecular ring assemblies including five-membered pentagons exhibiting high stabilities in solution and remarkable flexibility that allows them to be easily converted to other ring sizes by the addition of different anions. Another goal is to study chemical reactions triggered by the capture or release of anions which may be a way to alter the physical and chemical properties of the assemblies. Data from solid-state, solution, gas phase and computational studies will be used to assess the strength of anion-pi forces and to assist in future experiments aimed at predicting structures. One application of this research will be to design very large polyhedral molecules by using the five-membered ring molecules as building blocks. Another application will be to construct molecular magnets by taking advantage of the ease of reduction of tetrazine ligands to prepare organic radicals that can act as bridges between paramagnetic metal ions. The broader impacts of the research include graduate student and postdoctoral researcher training in the chemical sciences, efforts to broaden the participation of underrepresented groups in chemical science research, and outreach to local museums and science fairs in order to enhance scientific and technological understanding. The versatility of skills required to work on the project presents an excellent opportunity for students to learn about a broad spectrum of research disciplines. In this project the assembly of organic molecules and metal ions will be harnessed to promote the formation of large geometric structures that often can display unusual properties useful for applications. This work will expand the repertoire of chemistry that can be used to create magnetic and conducting materials starting with molecular components. The results of these studies could have many important long term impacts on a variety of applications in which magnetic materials are important, including non-volatile memory and spintronics.

在这个由化学系高分子、超分子和纳米化学项目资助的项目中，德克萨斯农工大学的 Kim Dunbar 将研究阴离子-π 相互作用的各个方面：阴离子与芳香族分子的相互作用。目标是研究含有正电四嗪环的配体的金属络合物，这些配体形成不寻常的分子环组件，包括五元五边形，在溶液中表现出高稳定性和显着的灵活性，使它们可以通过添加不同的阴离子轻松转换为其他环尺寸。另一个目标是研究由阴离子的​​捕获或释放引发的化学反应，这可能是改变组件物理和化学性质的一种方法。来自固态、溶液、气相和计算研究的数据将用于评估阴离子π力的强度，并协助未来旨在预测结构的实验。这项研究的一个应用是通过使用五元环分子作为构建块来设计非常大的多面体分子。另一个应用是利用四嗪配体易于还原的优势来制备可以充当顺磁性金属离子之间桥梁的有机自由基，从而构建分子磁体。该研究的更广泛影响包括化学科学方面的研究生和博士后研究员培训、努力扩大代表性不足的群体对化学科学研究的参与，以及向当地博物馆和科学博览会进行宣传以增强科学和技术理解。 该项目所需的多功能技能为学生提供了了解广泛的研究学科的绝佳机会。在该项目中，将利用有机分子和金属离子的组装来促进大型几何结构的形成，这些结构通常可以表现出对应用有用的不寻常特性。 这项工作将扩展化学库，可用于从分子成分开始制造磁性和导电材料。 这些研究的结果可能会对磁性材料发挥重要作用的各种应用产生许多重要的长期影响，包括非易失性存储器和自旋电子学。