New dinuclear fluorine-containing bis(salicylidene)imine titanium complex: synthesis and catalytic properties in polymerization of ethylene and propylene

Abstract

New dinuclear titanium(IV) dichloride complex with the chelating bis 4,4´ bis imine (3,5 di tert butylsalicylidene)octafluorobiphenyl ligand was synthesized. In the presence of polymethylaluminoxane (MAO), the complex showed high catalytic activity in ethylene poly merization leading to high molecular (M n ∼2500000) linear polyethylene with a high polydis persity index (M w /M n ∼7.0) and high melting point (142 °С). The catalytic activity in propylene polymerization in a medium of liquid monomer is substantially lower, and the polypropylene formed is a high molecular atactic elastomer.

FI Catalysts for Olefin Polymerization—A Comprehensive Treatment

“…These R 1 linked phenoxy−imine ligands possibly resulted in the formation of macrocyclic complexes of the type (L FI −L FI ) 2 (MX n ) 2 . − …”

“…75,77 These R 1 linked phenoxy-imine ligands possibly resulted in the formation of macrocyclic complexes of the type (L FI -L FI ) 2 -(MX n ) 2 . [125][126][127] Another approach for multinuclear phenoxy-imine complexes is to connect the phenol moiety, that is, to use biphenyl-2,2 0 -diol (for example, complex 20 in Chart 27) [128][129][130] or naphthalene-1,8-diol (for example, complexes 21 and 22 in Scheme 22). [131][132][133][134] The use of 2-hydroxyisophthalaldehyde and certain amines furnished [N,O,N] type tridentate ligands, which can bind nickel metals in different ways depending on the ligand structures, affording different multinuclear complexes.…”

“…There were attempts to prepare a macrocyclic binuclear complex using two tetradentate ligands, (L FI-FI ) 2-, and two group 4 metal precursors, to generate (L FI-FI ) 2 (MX 2 ) 2 . [125][126][127] 8. POLYMERIZATION WITH PHENOXY-IMINE RE-LATED COMPLEXES…”