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KMID : 1059520070510060499
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Journal of the Korean Chemical Society
2007 Volume.51 No. 6 p.499 ~ p.505
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Nickel Complexes Having (N-C-N) Tridentate Ligands
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Lee Dong-Hwan
Park Soon-Heum
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Abstract
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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.
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KEYWORD
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bis(imino)aryl, NCN-pincer, Terdentate, Ni(II) pincer complex, Catalyst, Oxidative addition
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