Dramatic enhancement of the stability of rare-earth metal complexes with α-methyl substituted N,N-dimethylbenzylamine ligands
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- 作者：Alex R. Petrov ; Oliver Thomas ; Klaus Harms ; Konstantin A. Rufanov ; Jö ; rg Sundermeyer
- 关键词：Rare-earth metals ; Yttrium ; Samarium ; Neodymium ; Dysprosium ; Lutetium
- 刊名：Journal of Organometallic Chemistry
- 出版年：2010
- 出版时间：1 December 2010-15 December 2010
- 年：2010
- 卷：695
- 期：25-26
- 页码：2738-2746
- 全文大小：653 K
文摘
Stepwise substitution of benzylic CH2 protons in ortho-metallated N,N-dimethylbenzylamine (dmba) ligands leads to chiral ortho-metallated N,N,α-trimethylbenzylamine (tmba) and cumyl-N,N-dimethylamine (cuda) ligands. These larger ligands with less or no acidic protons in benzylic position prove to stabilize some of those homoleptic tris-aryls of the larger (middle) and largest (early) rare-earth metal cations, for which such tris-aryl or tris-dmba complexes could not be synthesized so far. The syntheses, characterization and crystal structures of [Li(cuda)], [(tmba)2Lu(μ-Cl)]2 (1), [(tmba)2Y(μ-Cl)]2 (2), [Y(tmba)3] (3), [Dy(tmba)3] (4), [Nd(tmba)3] (5), [Sm(tmba)3] (6), and [Sm(cuda)3] (7) are reported, trends in complex stability are discussed.