Synthesis and Characterization of Pyrrole-imine [N⁻NP] Nickel(II) and Palladium(II) Complexes and Their Applications to Norbornene Polymerization

Abstract

Ni(II) and Pd(II) complexes based on N-((1H-pyrrol-2-yl)methylene)-2-(diphenylphosphino)benzenaminewere synthesized and characterized. X-ray diffraction studies on complexes 1, 2, and 4 revealed that N, N, P, and halogen atoms coordinated to metal, with distorted square planar geometries in all cases. Upon treatment with modified methylaluminoxane (MMAO), the [N -NP]Ni(II)X complexes are robust and exhibit high activity for the vinyl addition polymerization of norbornene (up to 5.46 × 10 7 g PNB/mol(Ni) • h • atm).

Ethylene homopolymerizaton and copolymerizaton by vanadium(III) complexes containing tridentate or tetradentate iminopyrrolyl ligands

“…The other reagents and solvents were commercially available. The ligands used were synthesized according to the literature methods 48–50…”

Well-defined vanadium complexes as the catalysts for olefin polymerization

“…Besides, iminopyrrolide ligands have been used in group 4 [73][74][75][76][77][78][79][80], group 6 [81], and group 10 metal systems [82,83] and have already been shown to afford highly active olefin (co)polymerizations. Different from mono(␤-enaminoketonato) vanadium(III) complexes and salicylaldiminato vanadium(III) complexes (Fig.…”

Synthesis and characterization of tridentate phenoxy‐imine ligand [N,N,O] nickel(II) and palladium(II) complexes and their catalytic behaviors in vinyl polymerization of norbornene

“…Of them, most are involved in bidentate ligand‐derived complexes 53–61. A few nickel and palladium complexes based on tridentate ligands were reported for NB polymerization,62–65 except limited examples related to oligomerization of ethylene 66–71. For developing new late‐metal olefin polymerization catalysis, we designed and synthesized the nickel and palladium complexes based on 4,6‐di‐ tert ‐butyl‐2‐( N ‐(quinolin‐8‐yl)iminome thyl)phenol (LH).…”