The synthesis and X-ray structure of various octahedral zirconium complexes and their catalytic properties in the polymerization of α-olefins are described. Benzamidinate, amido, allylic, and phosphinoamide moieties comprise the study ligations. For the benzamidinate complexes, a comparison study between homogeneous and heterogeneous complexes is presented. For the phosphinoamide complex, we show that the dynamic symmetry change of the complex from C2 to C2v allows the formation of elastomeric polymers. By controlling the reaction conditions of the polymerization process, highly stereoregular, elastomeric, or atactic polypropylenes can be produced. The formation of the elastomeric polymers was found to be the result of the epimerization of the last inserted monomer to the polymer chain.
|Title of host publication||Octahedral Zirconium Complexes as Polymerization Catalysts|
|Number of pages||43|
|State||Published - 11 Nov 2004|
- Octahedral complexes