Metallacarboranes: New Frontiers of Organometallics

南卫理公会大学化学系Narayan Hosmane博士在无机、生物无机和有机金属化学项目的支持下，对小碳硼烷配体复合物的制备和化学进行了研究。制备了配位不饱和镧碳硼烷，并将其用作14电子金属烷基衍生物的前体。建立“碳分离”六原子碳硼烷与主基团、早期过渡和镧系金属的反应模式，并与相关的“碳分离”衍生物进行比较。中性、两性离子和/或离子、14电子碳硼烷和混合配体配合物将被制备和评价作为齐格勒-纳塔烯烃聚合催化剂。为了在许多重要的应用中利用金属离子，通常有必要将它们包含在分子组合中，使它们能够以受控的方式与其他物种相互作用。实现这一目标的一种常见方法是利用可能附着在金属上的基团（配体），以创造金属的特定所需环境。在这个项目中，将研究一类相对未被研究过的“配体”化合物，即六原子碳硼烷，以了解它们稳定电子差金属的能力，从而形成有价值的催化剂。

9400672 Hosmane Southern Methodist Univ. Dr. Narayan Hosmane, Chemistry Department, Southern Methodist University, is supported by the Inorganic, Bioinorganic, and Organometallic Chemistry Program for an investigation into the preparation and chemistry of complexes of small carborane ligands. Coordinately unsaturated lanthanacarboranes will be prepared and utilized as precursors to 14-electron metal alkyl derivatives. The reactivity patterns of "carbon separated" six-atom carboranes will be established with main group, early transition, and lanthanide metals and comparisons will be drawn with related "carbon apart" derivatives. Neutral, zwitterionic, and/or ionic, 14-electron carborane and mixed ligand complexes will be prepared and evaluated as Ziegler-Natta olefin polymerization catalysts. In order to utilize metal ions in many important applications, it is often necessary to contain them in molecular assemblages which permit them to interact with other species in a controlled fashion. A common way of achieving this goal is to utilize groups (ligands) which may be attached to a metal in order to create a specific desired environment about the metal. In this project compounds a relatively unstudied class of "ligands", the six atom carboranes, will be studied to learn their ability to stabilize electron poor metals so that they may form valuable catalysts.