New and Improved Weakly Coordinating Anions and Their Applications

科罗拉多州立大学的Strauss教授将在无机、生物无机和有机金属化学项目的资助下继续研究弱配位阴离子。新的目标阴离子将是多氟离子，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体的配位配合物（如氯烷）的研究，并可能有助于产生新的均相催化剂。其他靶阳离子包括硅基阳离子、Fe(por) +和Zr(Cp)2(Me) +。第四个领域将是合成基团金属阳离子的羰基配合物的制备。带正电荷的分子称为“阳离子”。当复合阳离子是由原子或原子团与中心金属原子结合而成时，这个原子通常有一定数量的其他原子与它紧密结合。然而，当这些阳离子参与化学反应时，它们可以与较少数量的束缚原子或与一个非常弱的束缚原子短暂地存在；这些不寻常的状态对反应至关重要，但由于它们的不稳定性，很难对它们进行检测。减轻这些困难的实验将通过制备特殊的不反应性阴离子来进行，这些阴离子带负电荷，是平衡阳离子电荷所必需的。预计这些新的阴离子将允许制备高活性阳离子，这将阐明基础化学，并可能作为新的工业催化剂。＊＊＊

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. ***