Methyl displacements from cyclopentadienyl ring planes in sterically crowded (C5Me5)3M complexes.

Methyl displacements from cyclopentadienyl ring planes in sterically crowded (C5Me5)3M complexes.
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空间拥挤 (C5Me5)3M 配合物中环戊二烯基环平面的甲基置换。

DOI:
10.1021/ic051130h
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发表时间:
2005
影响因子:
4.6
通讯作者:
J. Ziller
J. Ziller
中科院分区:
化学2区
文献类型:
--
作者:
W. Evans;S. Kozimor;J. Ziller

文献摘要

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在空间拥挤的(C(5)Me(5))(3)M配合物和空间正常的f-元素配合物中,比较了甲基取代基离开金属和离开双环平面的位移,试图评估这个参数在预测不寻常的(C(5)Me(5))(1-)环反应性中的效用。16个空间拥挤三轴系统的离面位移(iii)通式(C(5)Me(5))(3)M、(C(5)Me(4)R)(3)M的配合物(R = Et,(i)Pr,(t)Bu,SiMe(3)),(C(5)Me(5))(3)MX(X =阴离子)和(C(5)Me(5))(3)ML(L =中性配体)与[(C(5)Me(5))(2)U](2)(C(6)H(6)),(C(5)Me(5))(2)Sm(PC(4)H(2)(t)Bu(2)),和33个具有正常双金属行为和配位数为6 - 10的F-元素双(双)配合物的代表性实例。在一般情况下,空间拥挤的复合物的甲基位移值与其他复合物中的那些重叠,这表明结构扭曲的基础是复杂的。然而,如果在每个空间拥挤的复合物中的最极端的平面外位移与在不太拥挤的系统中的类似的最大平面外位移进行检查,似乎有一个基础来预测的反应性。
The displacements of the methyl substituents away from the metal and out of the cyclopentadienyl ring plane are compared in sterically crowded (C(5)Me(5))(3)M complexes vs sterically normal f-element complexes in an attempt to evaluate the utility of this parameter in predicting unusual (C(5)Me(5))(1-) ring reactivity. The out-of-plane displacements of 16 sterically crowded tris(cyclopentadienyl) complexes of general formula (C(5)Me(5))(3)M, (C(5)Me(4)R)(3)M (R = Et, (i)Pr, (t)()Bu, SiMe(3)), (C(5)Me(5))(3)MX (X = anion), and (C(5)Me(5))(3)ML (L = neutral ligand) are compared with [(C(5)Me(5))(2)U](2)(C(6)H(6)), (C(5)Me(5))(2)Sm(PC(4)H(2)(t)Bu(2)), and 33 representative examples of f-element bis(cyclopentadienyl) complexes with normal cyclopentadienyl behavior and coordination numbers ranging from 6 to 10. In general, the methyl displacement values of sterically crowded complexes overlap with those in the other complexes, which demonstrates that the basis of the structural distortions is complex. However, if the most extreme out-of-plane displacement in each of the sterically crowded complexes is examined vs the analogous maximum out-of-plane displacement in less crowded systems, there appears to be a basis for predicting cyclopentadienyl reactivity.