Abstract
Group-IV metals play an important role in the production of practical catalysts for polyethylene industry. To develop new highly active catalysts, we designed a new self-assembly strategy that leads to a new family of group-IV-metal multinuclear catalysts with bis-phenoxy-imine ligands. These multinuclear catalysts are formed via three bridging strategies, by linking the imine-N, the 4-position of phenolate, or the mixed linking strategy. The coordination environment of the catalysts was investigated with far-IR and Raman. The multiple imine-H shift found in 1H NMR revealed that the multinuclear catalysts are typical multi-site catalysts comprising of different coordination geometries. All the multinuclear catalysts were more active and stable, and produced polyethylene of higher MW than the corresponding mono-nuclear catalysts. The bridging spacer has an evident effect on catalytic activity, stability, polymer MW and incorporation rate of propylene into the polyethylene backbone.
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