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Structures and hyperfine properties of ferrocene muonium adducts

机译:二茂铁mu加合物的结构和超细性质

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The existence of multiple paramagnetic muonium adducts to ferrocene was first reported by Jayasooriya et al. in 1997, based on the presence of more than one component in the muon's spin relaxation (U.A. Jayasooriya, J.A. Stride, G.M. Aston, Appl. Magn. Reson. 13 (1997) 165.) Interpretation of the data was based on a model involving three paramagnetic species, assigned to two cycl open tadieny) ring adducts and a radical in which Mu binds directly to the metal. In this work, these species are studied by density functional methods. All three adducts are found to be stable in the staggered (antiprismatic) ring geometry, with the cyclopentadienyl adduct favored energetically by similar to 80 kJ mol(-1). No evidence is found for an agostic species of the type known for protonated ferrocenes. Computed values of A(iso) show strong method-dependence attributed to spin polarization and spin contamination effects. (c) 2005 Elsevier B.V. All rights reserved.
机译:Jayasooriya等人首次报道了二茂铁中存在多个顺磁性mu加合物。在1997年,基于在μ子的自旋弛豫中存在多个成分(UA Jayasooriya,JA Stride,GM Aston,Appl。Magn。Reson。13(1997)165.),数据的解释基于包含三个顺磁性物质,分配给两个环状的开环(tadieny)环加合物和一个其中Mu直接与金属结合的自由基。在这项工作中,通过密度泛函方法研究了这些物种。发现所有三个加合物在交错的(反棱形)环几何结构中都是稳定的,其中环戊二烯基加合物在能量上倾向于接近80 kJ mol(-1)。没有发现关于质子化二茂铁类型的易怒物种的证据。 A(iso)的计算值显示出强烈的方法依赖性,这归因于自旋极化和自旋污染效应。 (c)2005 Elsevier B.V.保留所有权利。

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