Fundamental Aspects of the Dinuclear Chemistry of Molybdenumand Tungsten

双核阳离子跃迁的配位化学 具有形式电荷的钼和钨的金属络合物 四到十个将通过综合来探索， 结构方法 配体的动力学和机理研究 取代反应和有机金属化学 双核金属中心将被引发。 这些结果可能 与经过彻底调查的 单核络合物由于金属-金属的影响 邦德 有序组装，如液晶和聚合物 以双核金属多重键为构筑物， 块将进行调查，重点是可控的 磁性，光学和电子性质，这些 大分子系统 双核前体首先 电离电位根据金属的不同而变化2伏 和取代基;这些特征应该允许大阵列 具有可调电子特性的大分子系统。 %%% 在这个项目中，无机，生物无机， 化学部的有机物计划，马尔科姆博士 H.印第安纳州大学的奇泽姆将继续研究 钼的双核配合物的丰富化学性质， 钨。 这些分子显示出相当大的希望， 均相催化剂 此外，它们还可以组装 在适当的条件下形成液晶和聚合物 可能具有作为新材料的有用特性。

The coordination chemistry of dinuclear cationic transition metal complexes of molybdenum and tungsten with formal charges of four to ten will be explored through synthesis and structural methods. Kinetic and mechanistic studies of ligand substitution reactions and the organometallic chemistry of dinuclear metal centers will be initiated. These results may differ substantially from the thoroughly investigated mononuclear complexes due to the influence of the metal-metal bond. Ordered assemblies such as liquid crystals and polymers formed by use of dinuclear metal multiple bonds as building blocks will be investigated, with emphasis on the controllable magnetic, optical, and electronic properties of these macromolecular systems. The dinuclear precursors have first ionization potentials that vary by two volts depending on metal and the substituents; these features should allow a large array of macromolecular systems with tunable electronic properties. %%% In this project in the Inorganic, Bioinorganic, and Organometallic Program of the Chemistry Division, Dr. Malcolm H. Chisholm of Indiana University will continue his studies of the rich chemistry of dinuclear complexes of molybdenum and tungsten. These molecules show considerable promise as homogeneous catalysts. In addition, they can be assembled under proper conditions to form liquid crystals and polymers that may have useful properties as new materials.