Metallaborane Chemistry, Synthesis of New Main Group Transition Element Cluster Types

在这项由无机化学、生物无机化学和金属有机化学计划支持的项目中，Thomas P.Fehlner博士将研究新的主要基团-过渡元素簇类型的合成。利用金属羰基硼烷的高反应性，将开发富金属金属硼烷的新路线。为了得到团簇结构形式相对稳定性的经验定义，我们将利用团簇阴离子的低温氧化偶联反应来形成亚稳态团簇。为了获得被认为是形成金属硼烷簇合物的中间体的顺磁性物种，我们将研究顺磁性金属有机前驱体与硼烷的反应。这些团簇将被用作配体来生成经典的配位络合物，这些络合物可能具有不寻常的电子性质，可能具有非线性光学行为。该项目涉及开发含有过渡金属和硼的簇合物分子的新合成方法。为了系统化团簇几何构型之间的结构关系，将开发一条通往亚稳态团簇的低温路线。将制备含有未配对电子的金属簇合物。这些物种将被用来形成更大的集群。这项工作对理解大团簇的成键和反应性以及非线性光学器件的设计都有应用价值。

In this project supported by the Inorganic, Bioinorganic, and Organometallic Chemistry Program, Dr. Thomas P. Fehlner will investigate the synthesis of new main group-transition element cluster types. New routes to metal-rich metallaboranes will be developed by utilizing the high reactivity of metal carbonyl boranes. In order to obtain an empirical definition of the relative stability of cluster structural forms, a low temperature oxidative coupling reaction of cluster dianions will be used to form metastable clusters. In order to obtain paramagnetic species which are thought to be intermediates in the formation metallaborane clusters, the reactions of paramagnetic organometallic precursors with boranes will be investigated. The clusters will be used as ligands to produce classical coordination complexes which may have unusual electronic properties and may have nonlinear optical behavior. This project involves the development of new synthetic methods for cluster molecules which contain a transition metal and boron. To systematize the structural relationships between cluster geometries, a low temperature route to metastable clusters will be developed. Metal cluster compounds will be prepared which contain unpaired electrons. These species will be utilized to form yet larger clusters. This work has application both to the understanding the bonding and reactivity of large clusters and to the design of nonlinear optical devices.