• Title/Summary/Keyword: bis(imino)aryl

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Nickel Complexes Having (N-C-N) Tridentate Ligands ((N-C-N) 세자리 리간드를 가지는 니켈 착물)

  • Lee, Dong-Hwan;Park, Soon-Heum
    • Journal of the Korean Chemical Society
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    • v.51 no.6
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    • pp.499-505
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    • 2007
  • Monomeric complexes of nickel(II) having terdentate bis(imino)aryl ligands (N,C,N-pincer) are reported. New complexes (2,6-(ArN=CH)2C6H3)NiBr (Ar=2,6-dimethylphenyl (1), 2,6-diisopropylphenyl (2)) have been synthesized through oxidative addition of 1,3-(ArN=CH)2C6H3Br (bis(N-Ar)-2-bromoisophthalaldimine: Ar=Ph-2,6-Me2, Ph-2,6-iPr2) to Ni(COD)2 (COD=1,5-cyclooctadiene), in high yields. The development of a synthetic route to ligands and nickel complexes is outlined. The complexes were characterized by IR, 1H-NMR and elemental analysis. Full characterization of complexes 1 and 2 is discussed. An investigation into the catalytic activity of the complexes in ethylene polymerization was performed, resulting in no formation of polyethylenes but producing a small amount of oily oligomers. Preliminary results indicate that the pincer complexes were found to be inactive as catalysts in ethylene polymerization.

Bis(imino)aryl Complex of Nickel(II): N,C,N-Pincer Type Complex, (2,6-(2,6-Et2PhN=CH)2C6H3)NiBr

  • Lee, Dong-Hwan;Hong, Sung-Won;Park, Soon-Heum
    • Bulletin of the Korean Chemical Society
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    • v.29 no.1
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    • pp.187-190
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    • 2008
  • The synthesis of a novel N,C,N-type pincer, bis(N-aryl)-2-bromoisophthalaldimine 2,6-(2,6-Et2PhN = CH)2C6H3Br (1) and Ni(1)Br (2) is described. They were characterized by elemental analysis and spectroscopic techniques (IR and 1H NMR). Attempted ethylene polymerization catalyzed by 2 has been futile, leading only to the formation of a small amount of oily oligomers.