Metallaborane Chemistry: From Small Heterobimetallaboranes to Large Metallaheteroboranes

劳伦斯巴顿博士，化学系，密苏里大学圣。 路易斯，是由无机，生物无机和有机支持， 化学系金属硼烷研究计划 化学. 异双金属硼烷衍生自多面体 通过用各种金属取代两个硼顶点的硼烷将 合成。早期过渡金属将与晚期金属结合 以获得具有不同电子构型的金属的物质。 由于前过渡金属络合物是良好的聚合催化剂， 将制备仅含有这些金属的杂双金属硼烷， 评价为硼烷低聚催化剂。这项工作将延长 将主族非金属原子结合到 单金属硼烷。将寻求大型笼式衍生物的途径， 将评估簇替代过程的机制。 硼烷形成一系列具有规则结构的化合物和离子， 其中硼-氢单元限定多面体的顶点。的能力 支撑这些笼状结构的硼是独一无二的。这个的目的是 项目是将这些笼子中的一些顶点替换为 非硼原子。特别强调的是， 过渡金属和具有过渡金属和主族的那些 非金属原子这些物种将被设计为可能的催化剂， 作为探针，以确定替代如何在 硼烷。后一个目标对于准备新的 特定形状和组成的金属硼烷。除了新 这个项目将揭示的化学，博士后，研究生， 本科生将接受非常精确的教育， 研究硼氢化物所需的实验技术。

Dr. Lawrence Barton, Chemistry Department, University of Missouri-St. Louis, is supported by the Inorganic, Bioinorganic, and Organometallic Chemistry Program of the Chemistry Division for research on metallaborane chemistry. Heterobimetallaboranes that are derived from polyhedral boranes by substituting two of the boron vertices by various metals will be synthesized. Early transition metals will be combined with late metals to obtain species with metals of different electronic configurations. Since early transition metal complexes are good polymerization catalysts, heterobimetallaboranes containing only these metals will be prepared and evaluated as borane oligomerization catalysts. The work will be extended to the incorporation of main group nonmetal atoms into a monometallaborane. Routes to large cage derivatives will be sought and the mechanisms of cluster substitution processes will be evaluated. Boranes form a series of compounds and ions with regular structures in which boron-hydrogen units define the vertices of polyhedra. The ability of boron to support these cage structures is unique. The object of this project is to substitute some of the vertices in such cages with non-boron atoms. Special emphasis will be placed on examples with two transition metals and ones with a transition metal and a main-group nonmetal atom. These species will be designed as possible catalysts and as probes to determine the details of how substitution occurs in the boranes. This latter objective is important to preparing new metallaboranes of specific shape and composition. In addition to the new chemistry that will be uncovered in this project, postdoctoral, graduate, and undergraduate students will be educated in the very precise experimental techniques required for the investigation of boron hydrides.