Organic and Organometallic Chemistry

这个无机、生物无机和有机金属项目的奖项为加州大学伯克利分校化学系的Robert G. Bergman博士在有机金属化学领域的研究提供了持续的支持。将研究由各种桥接基团连接的早-晚过渡金属组成的杂双金属化合物的合成和反应。其中一项研究涉及具有桥接亚甲基和烷基烯配体以及钽和铂或钽和钴金属中心的可溶性化合物，这些化合物已被发现可作为烯烃加氢、异构化和氢化反应的催化剂。以及一氧化碳和氢气转化为甲烷和甲醇和一氧化碳转化为乙酸。这些催化过程的机制将被确定，特别是在立体化学方面，以及测试其他金属组合的有效性。该项目的目标是开发系统合成含有两个过渡金属中心的新分子的方法，并探索它们与有机分子反应的细节。这两种金属将是早期（例如，Zr或Ta）和晚期（例如，Ir或Co）过渡金属，并且将具有不同的电子性质。它们通过含有碳、氧、氮和硫的桥接基团连接，由于双金属环境的影响，它们可以以新的方式与有机分子反应。本研究结果与催化表面等复杂多金属体系中的反应有关。

This award in the Inorganic, Bioinorganic, and Organometallic Program provides continued support for research by Dr. Robert G. Bergman of the Chemistry Department, University of California at Berkeley in the area of organometallic chemistry. Synthesis and reactions of heterobimetallic compounds composed of early-late transition metals linked by a variety of bridging groups will be studied. One of the investigations concerns soluble compounds with bridging methylene and alkylidene ligands and metals centers of tantalum and platinum or tantalum and cobalt, which have been found to act as catalysts for the hydrogenation, isomerization, and hydrosilation of alkenes, as well as for the coversion of carbon monoxide and hydrogen to methane and the conversion of methanol and carbon monoxide to acetic acid. The mechanism of these catalytic processes will be determined, particuarly with regard to stereochemistry, and the effectiveness of other combinations of metals tested. %%% The goal of the project is to develop methods for the systematic synthesis of new molecules containing two transition metal centers and to explore the details of their reactions with organic molecules. The two metals will be an early (e.g., Zr or Ta) and a late (e.g., Ir or Co) transition metal, and will have different electronic properties. They are connected by bridging groups containing carbon, oxygen, nitrogen, and sulfur, which can react with organic molecules in novel ways because of the influence of the bimetallic environment. The findings of this research are relevant to reactions in complicated multi-metal systems such as catalytic surfaces.