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http://dx.doi.org/10.5012/jkcs.2007.51.6.499

Nickel Complexes Having (N-C-N) Tridentate Ligands  

Lee, Dong-Hwan (Department of Chemistry, Dongeui University)
Park, Soon-Heum (Department of Chemistry, Dongguk University)
Publication Information
Journal of the Korean Chemical Society / v.51, no.6, 2007 , pp. 499-505 More about this Journal
Abstract
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.
Keywords
bis(imino)aryl; NCN-pincer; Terdentate; Ni(II) pincer complex; Catalyst; Oxidative addition;
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