Dramatic enhancement of the stability of rare-earth metal complexes with α-methyl substituted N,N-Dimethylbenzylamine (cas 103-83-3) ligands
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Add time:08/15/2019 Source:sciencedirect.com
Stepwise substitution of benzylic CH2 protons in ortho-metallated N,N-Dimethylbenzylamine (cas 103-83-3) (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.
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