Syntheses of some new group 4 non-Cp complexes bearing schiff-base, thiophene diamide ligands respectively and their catalytic activities for α-olefin polymerization

✍ Scribed by Ji-Ling Huang; Bing Lian; Li Yong; Yan-Long Qian

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 645 KB
• Volume: 22
• Category: Article
• ISSN: 0256-7660
• DOI: 10.1002/cjoc.20040220617

✦ Synopsis

Abstract

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(OP~T~‐i)~4~ (M=Ti, Zr) with the corresponding 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 TiCl~4~ in toluene at 120 °C. All complexes are well characterized by ^1^H NMR, IR, MS and elemental analysis. When activated by excess methylaluminoxane (MAO), complexes show moderate catalytic activity for ethylene polymerization, and complex 1f (R^1^=CH~3~, R^2^=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.