摘要
Totally sixteen new titanium and zirconium non-Cp complexes supported by Schiff-base, or thiophene diamide ligands have been synthesized. The complexes are obtained by the reaction of M(OPr-i)4 (M=Ti, Zr) with the cor-responding Schiff-base ligand in 1∶1 molar ratio in good yield. The thiophene diamide titanium complex has been prepared from trimethylsilyl amine [N,S,N] ligand and TiCl4 in toluene at 120 ℃. All complexes are well charac-terized by 1H NMR, IR, MS and elemental analysis. When activated by excess methylaluminoxane (MAO), com-plexes show moderate catalytic activity for ethylene polymerization, and complex 1f (R1=CH3, R2=Br) exhibits the highest activity for ethylene and styrene polymerization. When the complexes were preactivated by triethylaluminum (TEA), both polymerization activities and syndiotacticity of the polymers were greatly improved.
Totally sixteen new titanium and zirconium non-Cp complexes supported by Schiff-base, or thiophene diamide ligands have been synthesized. The complexes are obtained by the reaction of M(OPr-i)4 (M=Ti, Zr) with the cor-responding Schiff-base ligand in 1∶1 molar ratio in good yield. The thiophene diamide titanium complex has been prepared from trimethylsilyl amine [N,S,N] ligand and TiCl4 in toluene at 120 ℃. All complexes are well charac-terized by 1H NMR, IR, MS and elemental analysis. When activated by excess methylaluminoxane (MAO), com-plexes show moderate catalytic activity for ethylene polymerization, and complex 1f (R1=CH3, R2=Br) exhibits the highest activity for ethylene and styrene polymerization. When the complexes were preactivated by triethylaluminum (TEA), both polymerization activities and syndiotacticity of the polymers were greatly improved.
基金
Project supported by the Special Funds for Major State Basic Research Projects (No. G 1999064801)
the National Natural Science Foundation of China (No. 20072004 ) and the Research Fund for the Doctoral Program of High Education (No. 20020251002).
