Chemistry of C-Trimethylsilyl-Substituted Main Group Heterocarboranes

该奖项由无机，生物无机和有机化学 化学计划是在一般领域的 金属碳氢化物金属碳硼烷化合物具有 由于不寻常的类型， 化学键，他们说明，也是实用的 因为它们是重要陶瓷的前体 并可用于合成新材料， 电性能，如一维导体。 该项目的主要重点是综合扩展的 主族杂碳硼烷体系， 结构、电学和光谱特性。新 主族杂碳硼烷的电荷转移络合物将 合成并得到它们的结构。特别 感兴趣的是这些复杂的因素， 顶端杂原子的滑移， 与该顶端杂原子结合的配体，以及 配体碱性对簇成键和结构的影响。还要 探索的是以前工作提出的化学新领域 在M（II）-插入闭合-和M（IV）-夹在 commo-碳硼烷（M=Si和Ge）。这将包括综合 由多层堆叠的硅、锗和混合的 硅/锗夹心配合物及其结构的研究 电性能杂碳硼烷的最终面积 要探索的化学是直接合成方法， 扩展、开发和发展主族反应 杂碳硼烷，其中顶端杂原子经历 主要是非还原性取代反应， 各种主族和过渡金属。

This award from the Inorganic, Bioinorganic and Organometallic Chemistry Program is in the general area of metallacarboranechemistry. Metallacarborane compounds are of substantial current interest because of the unusual types of chemical bonds which they illustrate, and are also of practical importance because they are precursors to important ceramics and can be used to synthesize new materials with interesting electrical properties, such as one-dimensional conductors. The major emphasis of the project is the synthesis of extended main group heterocarborane systems that may exhibit interesting structural, electrical and spectral properties. New charge-transfer complexes of main group heterocarboranes will be synthesized and their structures obtained. Of particular interest for these complexes are the factors which influence the slippage of the apical heteroatom, the orientation of ligands bound to this apical heteroatom, and the effect of ligand basicity on cluster bonding and structure. Also to be explored are new areas of chemistry suggested by previous work on the M(II)-inserted closo- and M(IV)-sandwiched commo-carboranes (M=Si and Ge). This will include the synthesis of several multilevel stacked silicon, germanium and mixed silicon/germanium sandwiched complexes and a study of their electrical properties. The final area of heterocarborane chemistry to be explored is direct synthetic approaches to extend, exploit and develop reactions of main group heterocarboranes in which the apical heteroatom undergoes predominantly nonreductive substitution reactions with a variety of main group and transition metals.