Syntheses of zirconium (IV) complexes with Schiff-base ligand and their catalytic activities for polymerization of ethylene

The syntheses of a series of zirconium Schiff-base complexes are reported. These complexes are synthesized by the reaction of zirconium (IV) isopropoxide with the unusual kind of Schiff-base in 1:1 molar ratio, and they are characterized by EA, IR and MS. When activated by excess methylaluminoxane (MAO), all complexes are active for the polymerization of ethylene.