Studies in Organotransition Metal-Polyboron Cluster Chemistry

该奖项来自无机，生物无机和有机金属化学项目，是有机金属化学的一般领域。本研究计划合成新型叠置有机金属配合物（多配体夹层化合物）和金属-硼-碳簇。这种扩展的三明治系统，其中电子在大量原子上离域，作为新型低维电导体或半导体的潜在前体，其中电流仅平行于链流动。这项研究的一个重要目的是发现具有不同寻常电子特性的新材料。碳硼烷、顺磁性过渡金属离子和多环芳烃是合成新型扩展夹层体系的主要组成部分。它们将组合成具有两个或多个金属中心的配合物，并设计成有利于金属之间电子的离域。新的配合物将通过多核核磁共振，红外，电子自旋共振和质谱，以及x射线晶体学进行表征，如果可能的话。将对这些化合物的几个家族进行详细的电化学研究。小的碳硼烷配体将与二硼烯单元结合，形成新的混合配体夹心体，可用于构建新型的大型多层夹心体体系，也可通过氧化配体融合生成新型的富碳碳硼烷。还将尝试合成（碳硼烷）金属（金属环）和（碳硼烷）金属（硼嗪）配合物，目前未知的化合物类型，并尝试配体之间的连接或融合。

This award from the Inorganic, Bioinorganic and Organometallic Chemistry Program is in the general area of organometallic chemistry. The research is concerned with the planned synthesis of new types of stacked organometallic complexes (multiligand sandwich compounds) and metal-boron-carbon clusters. Such extended sandwich systems in which electrons are delocalized over a large number of atoms are of interest as potential precursors to novel low-dimensional electrical conductors or semiconductors wherein the current flows only parallel to the chain. An important aim of the research is to discover new materials with unusual electronic properties. The principal building blocks which will be used to synthesize new extended sandwich systems are carboranes, paramagnetic transition metal ions, and polycyclic arenes. These will be combined in complexes having two or more metal centers and designed to favor delocalization of electrons between the metals. The new complexes will be characterized by multinuclear NMR, infrared, electron spin resonance and mass spectroscopy, as well as by X-ray crystallography, where feasible. Detailed electrochemical studies will be conducted on several families of these compounds. Small carborane ligands will be combined with diborolene units to create novel mixed-ligand sandwich species which may be used to construct large multilevel sandwich systems of a novel type, and which also may undergo oxidative ligand fusion to generate new classes of carbon-rich carboranes. Attempts will be made to also synthesize (carborane)metal(metallacycle) and (carborane)metal(borazine) complexes, types of compounds which are presently unknown, and to attempt linkage or fusion between the ligands.