Highly Reduced Organometallics of the d- and f-Block Elements

明尼苏达大学特温分校化学系John Ellis博士 城市，是由无机，生物无机和有机 化学部的计划，研究高度减少 早期d区和f区元素的有机金属。 两个主要 主题是使用芳烃自由基阴离子作为前体， 同配和杂配芳烃配合物及寻找新碳 这些元素的一氧化物和相关受体配体络合物化学。 含有多环芳烃的均配芳烃络合物， 萘、蒽及其取代形式将被 研究了这些物种预计相当不稳定， 作为中性或阴离子“裸”原子试剂， 过渡金属获得未知或罕见的均配阴离子复合物 将通过这些和相关的芳烃金属化物的反应来进行 与一氧化碳以外的配体，如膦，亚磷酸酯， 异氰化物、二烯和炔。高度还原的有机金属化合物是 对于理解化学和结构性质很重要 由正电性极强的元素组成的富含电子的化合物 并提供了一种研究这些元素的化学性质的方法， 以前无法达到或未知的氧化态。 一些金属，特别是锆和钽，形成高反应性和高分子。 在有机配体如萘（A 常见的成分在蛾球），当他们在一个高度减少 状态 “高度还原”仅仅意味着增加了更多的电子 这些金属络合物比他们通常会有，往往给他们 整体负电荷。这项工作涉及的综合， 高度还原的络合物和控制其反应性的问题 一旦形成。 这些配合物可能被证明是有用的试剂， 无机、有机金属和有机合成。

Dr. John Ellis, Department of Chemistry, University of Minnesota-Twin Cities, is supported by the Inorganic, Bioinorganic, and Organometallic Program of the Chemistry Division to study highly reduced organometallics of the early d- and f-block elements. The two primary themes are the use of arene radical anions as precursors to classes of homo- and heteroleptic arene complexes and the search for new carbon monoxide and related acceptor ligand complex chemistry of these elements. Homoleptic arene complexes containing polycyclic arenes such as naphthalene, anthracene and substituted versions thereof will be investigated. Such species are expected to be quite labile and may function as neutral or anionic `naked` atom reagents for the early transition metals. Access to unknown or rare homoleptic anionic complexes will be pursued through reactions of these and related arenemetallates with ligands other than carbon monoxide, such as phosphanes, phosphites, isocyanides, dienes, and alkynes. Highly reduced organometallics are important to an understanding of the chemical and structural properties of unusually electron-rich compounds of very electropositive elements, and provide a means of studying the chemistry of these elements in previously inaccessible or unknown oxidation states. Some metals, especially zirconium and tantalum, form highly reactive and useful reagents in the presence of organic ligands such as naphthalene (a common ingredient in moth balls) and when they are in a highly reduced state. `Highly reduced` simply means that more electrons have been added to these metal complexes than they would normally have, often giving them an overall negative charge. This work addresses the synthesis of such highly reduced complexes and the issues which control their reactivity once they are formed. These complexes may prove to be useful reagents in inorganic, organometallic and organic synthesis.