Systematics of the Synthesis and Reactivity of Heteronuclear Cluster Compounds

在这个由无机、生物无机和有机金属化学项目支持的项目中，南卡罗来纳大学的理查德·d·亚当斯博士将继续他对异金属多核团簇的研究。这些最近发现的化合物含有铂、钌或锇原子和羰基配体的三角形层。初步结果表明金属在与有机化合物的反应中具有选择性。本研究的主要目标是开发制备这些新型金属簇的系统方法，并全面研究不同金属层在底物配位中的选择性效应，以及它们在活化中的协同性。红外、多核磁共振和单晶x射线衍射结合反应性研究，包括动力学，将用于探索这些新的簇化合物。许多重要的工业非均相催化剂含有一种以上的金属。这些混合金属、异金属催化剂在其反应中比由单个金属产生的催化剂更活跃和/或选择性更强。这种协同作用的原因尚不清楚。该项目将利用新的异金属簇化合物来研究均相系统中的反应，然后可能与异相情况有关。所获得的信息可能有助于更好地理解混合金属、非均相催化剂具有独特性能的原因，并最终有助于合理设计新的催化剂。

In this project, which is supported by the Inorganic, Bioinorganic and Organometallic Chemistry Program, Dr. Richard D. Adams of the University of South Carolina will continue his studies of heterometallic polynuclear clusters. These recently discovered compounds contain triangular layers of platinum and ruthenium or osmium atoms and carbonyl ligands. Preliminary results suggest metal selectivity in reactions with organic compounds. Major objectives of the research are the development of systematic methods for preparation of these novel metal clusters and a comprehensive investigation of selectivity effects in coordination of substrates, and cooperativity in their activation, by the different metal layers. A combination of infrared, polynuclear NMR and single crystal x-ray diffraction coupled with reactivity studies, including kinetics, will be used to explore these new cluster compounds. A number of significant industrial heterogeneous catalysts contain more than one type of metal. These mixed metal, heterometallic catalysts are more active and/or selective in their reactions than are catalysts generated from the individual metals. The reasons for this synergistic action are not well understood. This project will utilize novel heterometallic cluster compounds to investigate reactions in homogeneous systems that may then be related to heterogeneous situations. The information obtained may allow for the development of a better understanding of the reasons why mixed metal, heterogeneous catalysts have unique properties and ultimately for the rational design of new catalysts.