Syntheses of Titanium(IV) Complexes with Mono-Cp and Schiff Base Ligands and Their Catalytic Activities for Ethylene Polymerization and Ethylene/1-Hexene Copolymerization

Abstract

The syntheses of two kinds of titanium(IV) complexes with mono-Cp and Schiff base as the mixed ligands are reported. These complexes are synthesized by the reaction of CpTiCl3 with the Schiff base lithium salt, and they are characterized by 1H NMR, EA, IR, and MS. When activated by excess methylaluminoxane (MAO), all complexes are active for ethylene polymerization and ethylene/1-hexene copolymerization. 1/MAO shows 3 times as active as complex 7 (Cp2TiCl2) to the ethylene/1-hexene copolymerization, and the molecular weight of the copolymer obtained by 1/MAO is almost 2 times that of complex 3 and 5 times that of complex 7. Complex 1 combines the advantages of non-metallocene (complex 3) and metallocene (complex 7) to the ethylene polymerization and ethylene/1-hexene copolymerization.