Metallaborane Chemsitry. Synthesis of New Main Group Transition Element Cluster Types

Thomas P. Fehlner博士，圣母大学化学系，受到化学系无机、生物无机和有机金属项目的支持，合成了包含主基团和过渡金属原子的新簇。该项目是一项三管齐下的调查。第一部分将探讨铬硼烷和相关团簇的化学性质，其中电子离域可以在整个团簇网络中发生。这些化合物的化学性质将用于确定簇上的反应位点，然后将其与簇的电子结构联系起来。其次，从已知的单环戊二烯金属配合物开始，将为含有广泛金属的二金属硼烷开发有效的合成路线。第三，这些二金属硼烷将用作低价金属碎片的配体，以形成多金属物种，其中过渡金属簇作为复合配体。过渡金属与含碳取代基结合时的化学反应是有机金属化学广阔领域的基础。这一领域的研究在纯化学和应用化学方面取得了许多进展。该项目旨在开辟一个相关领域，其中过渡金属与含硼单位结合。初步结果表明，这些“金属硼烷”将具有广泛的化学性质，在某些方面类似于有机金属化学，但在其他方面却截然不同。本研究将制备硼烷和过渡金属的新组合，并对其化学性质进行研究。新化合物将在新型反应化学中表现其电子结构的独特方面。

Dr. Thomas P. Fehlner, Department of Chemistry, University of Notre Dame, is supported by the Inorganic, Bioinorganic, and Organometallic Program of the Chemistry Division for the synthesis of new clusters containing both main-group and transition-metal atoms. The project is a three pronged investigation. The first part will explore the chemistry of chromaborane and related clusters where electron delocalizion can occur throughout the cluster network. The chemistry of these compounds will be used to define the reactive sites on the clusters, which will then be related to the clusters' electronic structure. Second, efficient synthetic routes, which begin from known monocyclopentadienyl metal complexes, will be developed for dimetallaboranes containing a wide ranging of metals. Thirdly, these dimetallaboranes will be used as ligands to low valent metal fragments in order to form polymetallic species where a transition metal cluster serves as a complex ligand. The chemistry of the transition metals when combined with carbon containing substituents is the basis of the vast field of organometallic chemistry. Research in this area has led to many advances in pure and applied chemistry. This project aims to open a related area in which transition metals are combined with units containing boron. Preliminary results indicate that these `metallaboranes` will possess an extensive chemistry that in some ways resembles organometallic chemistry, but in other ways is very different. In this investigation new combinations of boranes and transition metals will be prepared and their chemistry investigated. The new compounds will express the unique aspects of their electronic structures in new kinds of reaction chemistry.