New and Improved Weakly Coordinating Anions and Their Applications

9308583科罗拉多州立大学的施特劳斯教授将继续研究无机、生物无机和金属有机化学项目资助下的弱协调阴离子。新的目标阴离子将是多氟物种，如Sb(OTeF5)6-，Sb(OC(CF3)3)6-，以及以Ti4+和其他阳离子为中心原子的类似阴离子。这些阴离子的稳定盐将被制备、表征并用于分离异常活性的阳离子。这将影响具有非常弱配位配体(如氯代烷)的配位络合物的研究，并可能有助于产生新的均相催化剂。其他目标阳离子包括硅基阳离子、Fe(POR)+和Zr(Cp)2(Me)+。第四个领域将是硬币金属阳离子的羰基络合物的制备。带正电荷的分子称为“阳离子”。当通过将原子或原子基团键合到中心金属原子来构建络合阳离子时，该原子通常具有较佳数量的其他强键合原子。然而，当这些阳离子参与化学反应时，它们可以与较少的结合原子短暂存在，或者与一个结合很弱的原子短暂存在；这些不寻常的状态对反应至关重要，但由于它们的不稳定，很难检查它们。缓解这些困难的实验将通过制备特殊的非反应性阴离子和带负电荷的物种来进行，这些阴离子是平衡阳离子电荷所必需的。预计这些新的阴离子将能够制备高活性的阳离子，这些阳离子将阐明基础化学，并可能用作新的工业催化剂。***

9308583 Strauss Professor Strauss, of Colorado State University, will continue to investigate weakly coordinating anions with funding from the Inorganic, Bioinorganic, and Organometallic Chemistry Program. New target anions will be polyfluorinated species such as Sb(OTeF5)6 -, Sb(OC(CF3)3)6 -, and analogous anions having Ti4+ and other cations as central atoms. Stable salts of these anions will be prepared, characterized, and used to isolate unusually reactive cations. This will impact studies of coordination complexes having very weakly coordinated ligands (such as chloroalkanes), and it may help generate new homogeneous catalysts. Other target cations include silyl cations, Fe(por) +, and Zr(Cp)2(Me) +. A fourth area will be the preparation of carbonyl complexes of the coinage group metal cations. %%% Molecules that have a positive charge are called "cations". When complex cations are constructed by bonding atoms or groups of atoms to a central metal atom, this atom usually has a preferred number of other atoms strongly bonded to it. However, when these cations participate in chemical reactions they can exist briefly with either a reduced number of bound atoms or else with one bound quite weakly; these unusual states are crucial to the reactions, but they are difficult to examine because of their instability. Experiments to alleviate these difficulties will be performed by preparing specially unreactive anions, negatively charged species which are required in order to balance the charge of the cations. It is anticipated that these new anions will permit preparation of highly reactive cations that will elucidate fundamental chemistry and perhaps serve as new industrial catalysts. ***