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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Homolysis of the Ln-N (Ln = Yb, Eu) bond. Synthesis, structural characterization and catalytic activity of ytterbium(II) and europium(II) complexes with methoxyethyl functionalized indenyl ligands
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Homolysis of the Ln-N (Ln = Yb, Eu) bond. Synthesis, structural characterization and catalytic activity of ytterbium(II) and europium(II) complexes with methoxyethyl functionalized indenyl ligands

机译：Ln-N（Ln = Yb，Eu）键的均解。 （II）和euro（II）与甲氧基乙基官能化茚基配体的配合物的合成，结构表征和催化活性

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The interaction of methoxyethyl functionalized indene compounds (C_9H_6-1-R-3-CH_2CH_2OMe, R =t-BuNHSiMe_2(1), Me_3Si (2), H (3)) with [(Me_3Si)_2N]_3Ln(μCl)Li(THF)_3(Ln = Yb (4), Eu (5)) produced a series of new ytterbium(II) and europium(II) complexes via tandem silylamine elimination/homolysis of the Ln-N (Ln = Yb, Eu) bond. Treatment of the lanthanide(III) amides [(Me_3Si)_2N]_3Ln(μCl)Li(THF)_3(Ln = Yb (4), Eu (5) with 2 equiv. of 1, 2 and 3, respectively, produced, after workup, the ytterbium(II) complexes [5:1-Me_2Si(MeOCH_2CH_2C_9H_5)(NHBu-t)]_2YbII(6), (η~5:η~1-MeOCH_2CH_2C_9H_5SiMe_3)_2YbII(7), (η~5:η~1-MeOCH_2CH_2C_9H_6)_2YbII(8) and the corresponding europium(II) complexes [η~5:η~1-Me_2Si(MeOCH_2CH_2C_9H_5)(NHBu-t)]_2EuII(9), (5:1-MeOCH_2CH_2C_9H_5SiMe_3)_2EuII(10) and (η~5:η~1-MeOCH_2CH_2C_9H_6)_2EuII(11) in moderate to good yield. In contrast, interaction of the corresponding indene compounds 1, 2 or 3 with the lanthanide amides [(Me_3Si)_2N]_3Ln (Ln = Yb, Eu) was not observed, while addition of 0.5 equiv. of anhydrous LiCl to the corresponding reaction mixture produced, after workup, the corresponding ytterbium(II) or europium(II) complexes. All the new compounds were fully characterized by spectroscopic and elemental analyses. The structures of complexes 7, 9 and 10 were determined by single-crystal X-ray analyses. The catalytic activity of all the ytterbium(II) and europium(II) complexes on MMA polymerization was examined. It was found that all the ytterbium(II) and europium(II) complexes can function as single-component MMA polymerization catalysts. The temperature, solvent and ligand effects on the catalytic activity were studied.
机译：甲氧基乙基官能化的茚化合物（C_9H_6-1-R-3-CH_2CH_2OMe，R = t-BuNHSiMe_2（1），Me_3Si（2），H（3））与[（Me_3Si）_2N] _3Ln（μCl）Li（ THF）_3（Ln = Yb（4），Eu（5））通过串联硅烷甲胺消除/均化Ln-N（Ln = Yb，Eu）键生成一系列新的（II）和euro（II）配合物。分别处理了2当量的1、2和3等价的镧系元素（III）酰胺[（Me_3Si）_2N] _3Ln（μCl）Li（THF）_3（Ln = Yb（4），Eu（5），处理后，the（II）络合物[5：1-Me_2Si（MeOCH_2CH_2C_9H_5）（NHBu-t）] _ 2YbII（6），（η〜5：η〜1-MeOCH_2CH_2C_9H_5SiMe_3）_2YbII（7），（η〜5： η〜1-MeOCH_2CH_2C_9H_6）_2YbII（8）和相应的euro（II）络合物[η〜5：η〜1-Me_2Si（MeOCH_2CH_2C_9H_5）（NHBu-t）] _ 2EuII（9），（5：1-MeOCH_2CHuC_9HE_5SiII_3） （10）和（η〜5：η〜1-MeOCH_2CH_2C_9H_6）_2EuII（11），产率中等至良好;相反，相应的茚化合物1、2或3与镧系元素酰胺[[Me_3Si）_2N] _3Ln相互作用没有观察到（Ln = Yb，Eu），而在处理后向相应的反应混合物中添加了0.5当量的无水LiCl，相应的（II）或euro（II）配合物也得到了充分表征。通过分光光度法和元素分析法确定了配合物7、9和10的结构老式X射线分析。考察了所有all（II）和euro（II）配合物对MMA聚合的催化活性。发现所有all（II）和and（II）配合物均可以用作单组分MMA聚合催化剂。研究了温度，溶剂和配体对催化活性的影响。

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