Half-titanocene 5-t-butyl-2-(1-(arylimino)methyl)quinolin-8-olate chlorides: Synthesis, characterization and ethylene (co-)polymerization behavior

Abstract

A series of half-titanocene chloride complexes bearing 5-t-butyl-2-(1-(arylimino)methyl)quinolin-8-olates, CpTiLCl2, has been synthesized in acceptable yields by the stoichiometric reaction of CpTiCl3 with potassium 5-t-butyl-2-(1-(arylimino)methyl)quinolin-8-olates. All half-titanocene complexes were fully characterized by elemental analysis and NMR spectroscopy, and the molecular structures of complexes C1 and C2 (what are C1 and C2? ) were confirmed by single-crystal X-ray diffraction. When activated with methylaluminoxane (MAO) or modified methylaluminoxane (MMAO), all titanium complexes exhibited good activities (up to 4.8 × 10 5 g•mol -1 (Ti)•h -1 ) towards ethylene polymerization. The obtained polyethylene exhibited ultrahigh molecular weight (up to 11.82 × 10 5 g•mol -1 ) with narrow polydispersity. Furthermore, effective co-polymerization of ethylene with 1-hexene or 1-octene was achieved with several percentages of co-monomer incorporation in the resultant polyethylenes. IntroductionStill today, the most important thermoplastics are polyethylene-based materials, 1 N1-Ti1-Cl1 76.37(9) 76.95(9) N2-Ti1-Cl1 82.06(8) 82.58(8)