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Received April 25, 2002
Accepted May 23, 2002
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Olefin Homopolymerization Catalyzed over Asymmetric and Symmetric Ni(II) Diimine Complexes
1Department of Chemical and Biomolecular Engineering & Center for Ultramicrochemical Process Systems (CUPS), Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea 2Department of Chemical Engineering, Columbia University, New York, NY, 10027, Korea
siwoo@mail.kaist.ac.kr
Korean Journal of Chemical Engineering, July 2002, 19(4), 622-626(5), 10.1007/BF02699307
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Abstract
Symmetric and asymmetric Ni(II) diimine complexes such as 2-[(2,6-diisopropylphenylimino)methyl]pyridine nickel(II) dibromide (a), 2-[1-(2,6-diisopropylphenylimino)ethyl]pyridine nickel(II) dibromide (b) and [1,2-bis(2,6-_x000D_
diisopropylphenylimino)]acenaphthene nickel(II) dibromide (c) were synthesized. For olefin homopolymerization, asymmetric Ni(II) diimine complexes [(a) & (b)] were compared with symmetric system (c). Asymmetric Ni(II) diimine complexes exhibited less catalytic activity and thermal stability as well as more b-hydride elimination than a symmetric diimine complex (c). The activity of (a) was larger than that of (b), which indicates that methyl group has a contribution_x000D_
to the instability of catalyst by s bond vibration rather than the stabilization of the active site by electron releasing property.
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