Summary
Polymerization of ethylene and copolymerization of ethylene-propylene proceeded smoothly by using homometallic binuclear zirconium complex 1 or heterometallic binuclear zirconium-titanium complex 2/methylaluminoxane catalyst system. The molecular weight distributions of polymers obtained by the binuclear zirconium complexes were broader than that produced by mononuclear zirconium complex.
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The complex 2, complex 1 and Ti-Ti complex are easily distinguishable each other by 1H-NMR analysis. See Ref. 3 and 4.
As it is difficult to form di-cation in one molecule, it should be reasonable to assume only one zirconium center in the binuclear complexes 1 and 2 was active site for polymerization. See Ref. 7a.
By using homometallic binuclear complex 1, similar results were obtained concerning propylene content of the copolymer.
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Mitani, M., Oouchi, K., Hayakawa, M. et al. Olefin polymerization catalyzed by homoor heterobimetallic zirconocene complex/methylaluminoxane system. Polymer Bulletin 35, 677–682 (1995). https://doi.org/10.1007/BF00294949
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DOI: https://doi.org/10.1007/BF00294949