Polyhedral Cage Compounds of Silicon: On the Way to Nanoclusters

Braddock-Wilking U. Janet Braddock-Wilking博士，密苏里州大学圣路易斯分校化学系，由化学部无机、生物无机和有机化学计划提供研究计划资助，以开发含外围过渡金属取代基的硅的多面体笼状化合物的合成路线。 首先，通过三氯硅烷与富电子过渡金属配合物的氧化加成反应，生成一系列（三氯甲硅烷基）金属配合物。这些金属-甲硅烷基化合物然后将使用各种还原剂还原偶联以提供金属取代的多面体硅簇。新的硅核磁共振技术将被开发，以促进这些化合物的特性。 硅是现代技术中可用的最有用的材料之一，例如，硅晶片是电子工业的大部分的核心。然而，很少有人关注前体的设计，这将允许非常小的硅晶体具有明确的尺寸或硅具有特定的表面性质，以容易地获得。在这项研究中，将制备一类新的化合物，其中少量的硅原子相互连接，形成特定尺寸和几何形状的“笼子”。围绕硅笼的是另一种金属的护套。最终，这些化合物被设想为硅的小“纳米团簇”和金属硅化物薄膜的前体。

9409927 Braddock-Wilking U. of Missouri - St. Louis Dr. Janet Braddock-Wilking, Chemistry Department, University of Missouri - St. Louis, is supported by the Inorganic, Bioinorganic, and Organometallic Chemistry Program of the Chemistry Division with a Research Planning Grant to develop synthetic routes to polyhedral cage compounds of silicon containing peripheral transition metal substituents. First, a series of (trichlorosilyl)metal complexes will be generated by the oxidative addition of trichlorosilane to electron-rich transition metal complexes. These metal-silyl compounds will then be reductively coupled using various reducing agents to afford the metal substituted polyhedral silicon clusters. New silicon nuclear magnetic resonance techniques will be developed to facilitate the characterization of these compounds. Silicon is one of the most useful materials available in modern technology, for example, silicon wafers are central to a large portion of the electronics industry. However, very little attention has been devoted to the design of precursors which would permit very small silicon crystals with well defined sizes or silicon with specific surface properties to be easily obtained. In this research a new class of compounds will be prepared in which a small number of silicon atoms are joined to one another to make "cages" of specific sizes and geometries. Surrounding the silicon cages will be a sheath of another metal. Ultimately, these compounds are envisioned as precursors for small "nanoclusters" of silicon and for thin films of metal-silicides.