Heterocarboranes of Main Group Elements and Early TransitionMetals: Chemistry in Novel Directions

南卫理公会大学化学系的Narayan S. Hosmane博士正在无机、生物无机和有机金属项目的支持下合成扩展笼型碳硼烷物种，并表征它们的电化学、结构和光谱特性。这些新型化合物将包含主基团和早期过渡金属元素“夹”在碳硼烷笼之间，它们被连接成链。为了完成合成，Hosmane将利用碳硼烷笼的稳定性，通过连接c -三甲基硅基。稳定的碳硼烷碳离子是通过逐步去除这些硅基而生成的。此外，还将合成由嘧啶连接的金属硼烷笼。要制备的化合物在键合、结构和反应性方面都是不寻常的。因此，产生具有有趣电子特性的稳定物种是一种可能的结果。更重要的是，这将获得关于一类化合物的电化学性质的基本信息，这些化合物以前没有被研究过。此外，扩展阵列的设计合成和激活碳硼烷笼的方法的开发是硼烷和碳硼烷化学的重要进展，并对过渡金属硼烷和金属碳硼烷簇化学具有重要意义。

Dr. Narayan S. Hosmane of the Chemistry Department, Southern Methodist University, is being supported by the Inorganic, Bioinorganic, and Organometallic Program to synthesize extended cage carborane species and characterize their electrochemical, structural, and spectral properties. These novel compounds will contain main group and early transition metal elements "sandwiched" between carborane cages which are linked to form chains. To accomplish the synthesis, Hosmane will take advantage of the stabilization afforded carborane cages by attachment of the C-trimethylsilyl group. Stable carborane carbanions are to be generated by stepwise removal of these silyl groups. In addition, metallocarborane cages linked by pyrimidine will be synthesized. %%% The compounds to be prepared are unusual in terms of bonding, structure, and reactivity. As a result, production of stable species with interesting electronic properties is a possible outcome. More importantly, fundamental information will be obtained on the electrochemical properties of a class of compounds which has not been studied previously. Also, designed synthesis of extended arrays and development of a means of activating carborane cages are important developments in borane and carborane chemistry and have implications for transition metalloborane and metallocarborane cluster chemistry.