Mono-phosphacyclopentadienyl bis(tetramethylaluminate) lanthanide complexes.

Mono-phosphacyclopentadienyl bis(tetramethylaluminate) lanthanide complexes.
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DOI:
10.1039/b709633j
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发表时间:
2007-10
影响因子:
4
通讯作者:
Erwan Le Roux;F. Nief;F. Jaroschik;K. Törnroos;R. Anwander
Erwan Le Roux;F. Nief;F. Jaroschik;K. Törnroos;R. Anwander
中科院分区:
化学2区
文献类型:
--
作者:
Erwan Le Roux;F. Nief;F. Jaroschik;K. Törnroos;R. Anwander

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均配配合物Ln(AlMe(4))(3)(Ln = La,Nd)可以直接用于与2,3,4,5-四甲基磷酰化钾(KTMP)或3,4-二甲基-2,5-双(三甲基甲硅烷基)磷脂(KDsp),得到单磷杂环戊二烯烃基络合物(η(5)-PC(4)Me(4))Ln(AlMe(4))(2)和[η(5)-PC(4)Me(2)(SiMe(3))(2)]Ln(AlMe(4))(2)(Ln = La,Nd).的固态结构揭示了不同的金属尺寸效应所证明的单体钕TMP和DSP衍生物,以及二聚体镧TMP配合物的X-射线衍射分析。通过分子间P -> La供体接触实现二聚化。在用[PhMe(2)NH][B(C(6)F(5))(4)]活化时,单磷杂环戊二烯络合物引发异戊二烯的聚合,产生具有中等活性(约30 kg(PIP)mol(Ln)(-1)h(-1))的1,4-反式聚异戊二烯(tPIP > 87%)。
Homoleptic complexes Ln(AlMe(4))(3) (Ln = La, Nd) can be straightforwardly utilized in salt metathetic exchange reactions with potassium 2,3,4,5-tetramethylphospholide (KTmp) or 3,4-dimethyl-2,5-bis(trimethylsilyl)phospholide (KDsp) affording monophosphacyclopentadienyl hydrocarbyl complexes (eta(5)-PC(4)Me(4))Ln(AlMe(4))(2) and [eta(5)-PC(4)Me(2)(SiMe(3))(2)]Ln(AlMe(4))(2) (Ln = La, Nd). The solid-state structures reveal distinct metal size effects as evidenced by X-ray diffraction analyses of monomeric neodymium Tmp and Dsp derivatives as well as the dimeric lanthanum Tmp complex. Dimerization is accomplished by intermolecular P --> La donor contacts. Upon activation with [PhMe(2)NH][B(C(6)F(5))(4)] the monophosphacyclopentadienyl complexes initiate the polymerization of isoprene producing 1,4-trans-polyisoprene (tPIP > 87%) with moderate activity (approximately 30 kg(PIP) mol(Ln)(-1) h(-1)).