Synthesis, Reactivity, and Catalytic Studies of Mixed-Metal Gold Cluster Compounds

该奖项在无机，生物无机和有机化学 该计划为路易斯·H博士提供持续支持。皮尼奥莱 明尼苏达大学化学系， 研究了含金的混合金属簇合物， 铂和钯。 Pignolet将合成额外的 更大的簇分子， 金属，并使用体积较小的膦配体。 最近， 皮格诺莱特观察到氢分子可以平衡 氘分子在这些团簇的表面。 他 希望探索这种相互作用的机制， 描述所涉及的物种。 他还将研究 这些簇在氢化时的催化活性 均质和非均质条件。 催化剂 系统将使用TEM，XPS，化学吸附 和其他表面方法。 %%% 许多工业催化剂含有金属的混合物， 据推测，这些催化剂的有效性取决于 各种金属之间的协同作用。 混合 金属簇，含有8到20个金属原子， 被假定为有用的模型化合物，用于理解 这种催化活性的细节。 在这个项目中，Pignolet 会形成更大更多样的星系团 的稳定膦基团连接到金属， 以提高集群的催化效率。 的 将研究团簇的催化行为， 特别是用于氢化催化，以及游离的和 将研究氧化铝支撑的簇。 结果可能 提高对影响 催化剂的反应性。

This award in the Inorganic, Bioinorganic, and Organometallic Program provides continued support to Dr. Louis H. Pignolet of the Chemistry Department, University of Minnesota, for the investigation of mixed metal cluster compounds containing gold, platinum, and palladium. Pignolet will synthesize additional cluster molecules that are larger, contain a wider variety of metals, and use less bulky phosphine ligands. Recently, Pignolet has observed that hydrogen molecules can equilibrate with deuterium molecules on the surface of these clusters. He wishes to explore the mechanism of this interaction and characterize the species involved. He would also study the catalytic activity of these clusters upon hydrogenation under both homogeneous and heterogeneous conditions. The catalyst systems would be characterized using TEM, XPS, chemisorption and other surface methods. %%% Many industrial catalysts contain a mixture of metals, and it is speculated that the effectiveness of these catalysts depends on a synergistic interaction between the various metals. Mixed metal clusters, containing eight to twenty metal atoms, have been postulated as useful model compounds for understanding the details of such catalytic activity. In this project, Pignolet will make larger and more varied clusters and reduce the size of the stabilizing phosphine groups attached to the metals so as to enhance the cluster's catalytic effectiveness. The catalytic behavior of the clusters will be investigated, particularly for hydrogenation catalysis, and both free and alumina-supported clusters will be studied. The results could provide increased understanding of the factors affecting the reactivity of catalysts.