Main-Group Deltahedral Clusters: Functionalization and Oligomerization by Design

Slavi C.博士Sevov，化学和生物化学系，圣母大学，是由化学部的无机，生物无机和有机化学计划的支持，对同质和杂原子主群三角形簇（Zintl离子）的反应性的研究。这种簇的化学性质是独特的，因为组成元素处于不寻常的负氧化态，并有可能提供新的键合，结构，配位和反应性。研究的重点将是锗，硅，锡，II-V族元素和过渡金属的同质和异质原子阴离子簇的溶液和固态化学和键合。PI已经合成并表征了Ge 9簇的二聚体、三聚体和四聚体。这些研究将扩展到更大的低聚物的Ge和扩大到包括Si，和上述其他元素。一个主要的努力将涉及通过与亲核试剂反应使簇官能化。这将允许添加具有各种功能的有机基团，如多重键，芳环和杂原子，以及各种亲核有机金属取代基。这些簇的化学知识将有助于发现具有不寻常性能的新化合物和材料。这些团簇是新的经典材料（金属间化合物，扩展结构）以及具有新的电子和磁性的纳米材料（纳米棒，薄膜，表面接枝）的潜在前体。该项目有很强的教育成分。将对包括妇女和少数民族在内的本科生、研究生和博士后学生进行培训。

Dr. Slavi C. Sevov, Department of Chemistry and Biochemistry, Notre Dame University, is supported by the Inorganic, Bioinorganic, and Organometallic Chemistry Program of the Chemistry Division for studies on the reactivity of homo- and hetero-atomic main-group deltahedral clusters (Zintl ions). The chemistry of such clusters is unique in that the constituting elements are in unusual negative oxidation states and have the potential to provide novel bonding, structures, coordination, and reactivity. The focus of the research will be on the solution and solid state chemistry and bonding of homo- and hetero-atomic anion clusters of germanium, silicon, tin, group II-V elements, and transition metals. The PI has already synthesized and characterized dimers, trimers, and tetramers of Ge9 clusters. These studies will be extended to larger oligomers of Ge and broadened to include Si, and the other elements mentioned above. A major effort will involve functionalizing the clusters through reactions with nucleophiles. This will allow addition of organic groups with various functionalities such as multiple bonds, aromatic rings, and heteroatoms, as well as various nucleophilic organometallic substituents.The knowledge of the chemistry of these clusters will help in foreseeing new compounds and materials with unusual properties. Such clusters are of interest as potential precursors to new classical materials (intermetallics, extended structures) as well as nano materials (nanorods, thin films, surface grafting) with novel electronic and magnetic properties. The project has a strong educational component. The training of undergraduate, graduate, and postdoctoral students, that include women and minorities, will be undertaken.