Symmetrical Metal Alkoxides and Amides: Reactivity and Structural Studies

爱荷华州州立大学的约翰·弗卡德教授将 研究“atrane”配位化合物 无机、生物无机和有机金属计划。 这些 是具有多环醇盐的高度对称的化合物， 酰胺型配体。 一类化合物将使 在C3v环境中的金属中心与轴向胺。 的 其他类将是类似的，但与C2v（准四倍） 环境 过渡金属和主族金属 中心将使用。 初步研究将侧重于 合成这些有趣的物种。 Verkade还将 进行机械研究，其transmetallations，轴 配体置换和其他反应。 一个不寻常 所采用技术将是119Sn、51V和73Ge NMR 谱 %%% “Atranes”是一类有趣的化合物， 中心金属原子对称地结合到三个或四个 氧原子在一个平面上，而氮原子被束缚在 轴向。 在这样的化合物中，中心金属可以是 系统地变化，分子的其他特征也是如此。 它们的高度对称性赋予了它们高波动性， 提供了一种不寻常的机制， 金属原子 这些化合物的合成，以及 研究它们的反应性是目前资助的主题。

Professor John Verkade of Iowa State University will investigate "atrane" coordination compounds with support from the Inorganic, Bioinorganic, and Organometallic Program. These are highly symmetrical compounds with polycyclic alkoxide and amide-type ligands. One class of compounds will place the metal center in a C3v environment with an axial amine. The other class will be similar, but with a C2v (quasi-fourfold) environment. Both transition metal and main-group metal centers will be used. The initial studies will focus on synthesis of these interesting species. Verkade will also conduct mechanistic studies of their transmetallations, axial ligand displacements, and other reactions. An unusual technique to be employed will be 119Sn, 51V, and 73Ge NMR spectroscopy. %%% "Atranes" are an interesting class of compounds in which a central metal atom is bound symmetrically to three or four oxygen atoms in a plane, while a nitrogen atom is bound axially. In such compounds the central metal can be systematically varied, as can other features of the molecules. Their high symmetry endows them with high volatility, which provides an unusual mechanism for transporting the central metal atom. The synthesis of such compounds, as well as a study of their reactivity is the subject of the present grant.