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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >An unusual biphenylsubstituted lithiumchlorotriarylsamarate
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An unusual biphenylsubstituted lithiumchlorotriarylsamarate

机译:一种罕见的联苯取代的三芳基山梨酸锂

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摘要

The reaction of the lithium biphenyl LiPmph (Pmph = 2',3',4',5',6'-pentamethylbiphenyl) with samarium trichloride in a molar ratio of 3 to 1 affords under elimination of only 2 equivalents lithium chloride the lithium samarate [(thf)(3)Li][ClSm(Pmph)(3)(thf)] in a yield of 45%. In the obtained contact ion pair the samarium atom shows an only slightly distorted trigonal bipyramid coordination. Equatorial and axial positions are occupied by three propeller like arranged biphenyl substituents, the C1{... Li(thf)(3)}ligand, and a THF molecule, respectively. A rather unusual folding of the aryl ligands leads to comparably short distances of the Sm atom to the ortho-C-H-bonds and therefore to the formation of strong agostic interactions.
机译:联苯锂LiPmph(Pmph = 2',3',4',5',6'-五甲基联苯)与三氯化sa的摩尔比为3:1的反应在消除2当量氯化锂的情况下提供了山梨酸锂[(thf)(3)Li] [ClSm(Pmph)(3)(thf)],产率为45%。在获得的接触离子对中,sa原子仅显示出轻微扭曲的三角双锥体配位。赤道和轴向位置分别被三个螺旋桨状排列的联苯取代基,C1 {... Li(thf)(3)}配体和THF分子占据。芳基配体的相当不寻常的折叠导致Sm原子到邻-C-H键的距离相对较短,因此形成了强烈的胶态相互作用。

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