One-pot synthesis of symmetrical and unsymmetrical α-diimine Nickel complexes in comparison with two-pot synthesis method for ethylene polymerization

Beheshti, Maryam Sadat; Arabi, Hassan

doi:10.1007/s10965-022-03049-8

Cited by 4 publications

(3 citation statements)

References 32 publications

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“…The presence of bulky substituents in the ortho position of the N-aryl moiety improves the thermal stability [28][29][30]. ArN = C(H) (H)C = NAr, ArN = C(Me) (Me)C = NAr, acenaphthene, and camphorquinone have been used as mostly α-diimine backbones to study the effect of backbone on the catalytic behavior of α-diimine complex.…”

Section: Introductionmentioning

confidence: 99%

Increasing the thermal stability of α-diimine nickel (II) catalyst by camphorquinone as a great backbone and investigating the steric effects of this backbone in ethylene polymerization

Issaabadi,

Arabi,

Karimi

2023

J Polym Res

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In the α-diimine catalyst system, catalyst design with high thermal stability through ligand modifications is very challenging. This paper reports the preparation of three camphyl-based ligands with diverse steric effect and their Ni (II) complexes. To evaluate the backbone and ligand steric effects these nickel complexes were used as catalysts in the polymerization of ethylene. The camphyl-based catalysts show high thermal stability with good catalyst activity up to 75 °C. In ethylene polymerization using bulky isopropyl substitution in the ortho position of the aniline moieties, it is achievable to tune the catalytic activities (6 × 10 5 g/mol Ni.h), polymer molecular weights (16 × 10 4 g/mol), and polymer melting temperatures (to 117.5 °C) over an extensive range.

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Section: Introductionmentioning

confidence: 99%

Increasing the thermal stability of α-diimine nickel (II) catalyst by camphorquinone as a great backbone and investigating the steric effects of this backbone in ethylene polymerization

Issaabadi,

Arabi,

Karimi

2023

J Polym Res

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“…Researchers have focused on N‐aryl moiety substitutions and ligand backbone modification to increase the thermal stability of these catalytic systems 37–40 . Currently, acenaphthene and ArNC(R) (R)CNAr, R = Me, H, have been known as are known as the most widely used α‐diimine backbones 41–45 . Increasing the bulk of the substituent increases the stability, so changing the backbone substitution from H to Me increases the stability.…”

Section: Introductionmentioning

confidence: 99%

“…[37][38][39][40] Currently, acenaphthene and ArN C(R) (R)C NAr, R = Me, H, have been known as are known as the most widely used α-diimine backbones. [41][42][43][44][45] Increasing the bulk of the substituent increases the stability, so changing the backbone substitution from H to Me increases the stability. To investigate the backbone's effect on the catalyst's activity in the polymerization of ethylene, camphyl backbone as a bulky and thermostable backbone has attracted much attention.…”

Section: Introductionmentioning

confidence: 99%

Investigations of aryl substituents electronic effects in the catalytic behavior of thermostable α‐diimine nickel (II) catalyst on ethylene polymerization

Issaabadi

Arabi

Karimi

2023

Polymers for Advanced Techs

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In α‐diimine‐based catalytic systems, it is highly challenging to increase the thermal stability of the α‐diimine Ni(II) catalyst. In this work, we are focused on examining the polymerization of ethylene by a number of α‐diimine Ni(II) complexes with camphyl backbone and various electron‐donating and withdrawing substituents as catalysts. The synthesized camphyl‐based ligands were characterized by 1H nuclear magnetic resonance (NMR), 13C NMR, HH correlation spectroscopy, Fourier‐transform infrared (FT‐IR), and elemental analysis. The formation of the Ni(II) complexes was approved by the far infrared (Far‐IR) and energy dispersive x‐ray spectroscopy (EDS). The Box–Behnken method was used to select the optimal polymerization conditions. The ligand electronic effect on the catalytic activity of Ni(II) complexes in ethylene polymerization was systematically investigated. All of the synthesized complexes were active in ethylene polymerization with activities at 105 g of polyethylenes (PE) (mol of Ni h)−1. The electron‐withdrawing substituent catalyst exhibited high activity in ethylene polymerization.

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Phenyl-bridged bis-salicylaldiminato binuclear titanium complexes for ethylene (co)polymerization

Xue¹,

Luo²,

Ren³

et al. 2022

J Polym Res

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One-pot synthesis of symmetrical and unsymmetrical α-diimine Nickel complexes in comparison with two-pot synthesis method for ethylene polymerization

Cited by 4 publications

References 32 publications

Increasing the thermal stability of α-diimine nickel (II) catalyst by camphorquinone as a great backbone and investigating the steric effects of this backbone in ethylene polymerization

Increasing the thermal stability of α-diimine nickel (II) catalyst by camphorquinone as a great backbone and investigating the steric effects of this backbone in ethylene polymerization

Investigations of aryl substituents electronic effects in the catalytic behavior of thermostable α‐diimine nickel (II) catalyst on ethylene polymerization

Phenyl-bridged bis-salicylaldiminato binuclear titanium complexes for ethylene (co)polymerization

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