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

南方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计划的支持下，合成扩展笼状碳硼烷物种，并表征它们的电化学、结构和光谱性质。这些新化合物将包含主族元素和早期过渡金属元素，“夹在”碳硼烷笼子之间，这些笼子连接成链。为了完成合成，Hosmane将利用C-三甲基硅基连接提供的稳定的碳硼烷笼子。稳定的碳硼烷碳负离子是通过逐步去除这些硅基而产生的。此外，还将合成由嘧啶连接的金属碳硼笼。%要制备的化合物在成键、结构和反应活性方面都是不寻常的。因此，生产具有有趣电子性质的稳定物种是一种可能的结果。更重要的是，将获得关于一类以前没有研究过的化合物的电化学性质的基本信息。此外，设计合成扩展阵列和开发一种激活碳硼烷笼子的方法是硼烷和碳硼烷化学的重要发展，并对过渡金属硅烷和金属碳硼烷簇合物化学具有重要意义。

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.