Highly Reduced Organometallics of the Early Transition Elements

无机化学、生物无机化学和金属有机化学计划的这个项目的目标是合成和表征含有过渡元素的有机金属化合物，这些过渡元素处于以前未知的极低氧化状态。在最近合成的含有零价钛、锆和氢的有机膦化合物的基础上，我们将尝试合成首批含钪、Y和4F块状元素的金属羰基化合物。这项研究的一个重要组成部分将是确定在合成和稳定第4族和4f族嵌段元素的零价和次价羰基方面起重要作用的因素。还将审查一氧化碳以外的潜在受体配体的使用，如烯烃、炔烃、共轭双烯和二氮氮，以更充分地评估低价早期过渡元素在化学合成中的潜力。该项目有望为化学合成提供强有力的新试剂，并为以前只能通过金属原子气相合成少量制备的材料提供新的途径。

The goal of this project in the Inorganic, Bioinorganic and Organometallic Chemistry Program is the synthesis and characterization of organometallic compounds containing transition elements in previously unknown, extremely low oxidation states. Building on the recent synthesis of carbonyl and organophosphine compounds containing zerovalent titanium, zirconium and hafnium, prepared by reduction of metal halides with sodium napthenide, the synthesis of the first examples of metal carbonyls of scandium, yttrium and 4f block elements will be attempted. A significant component of the research will be to determine the factors which are important in the synthesis and stabilization of zero and subvalent carbonyls of the group 4 and 4f block elements. The use of potential acceptor ligands other than carbon monoxide, such as alkenes, alkynes, conjugated dienes and dinitrogen, will be examined also to assess more fully the potential of low-valent early transition elements in chemical synthesis. This project is expected to provide powerful new reagents for chemical synthesis, and to provide new routes to materials which previously could be prepared only in small amounts by metal atom vapor syntheses.