High Temperature Iron Ethylene Polymerization Catalysts Bearing N, N, N′-2-(1-(2,4-Dibenzhydryl-6-fluorophenylimino)ethyl)-6-(1-(arylphenylimino)ethyl)pyridines

Bariashir, Chantsalnyam; Zhang, Qiu-Yue; Ulambayar, Bayasgalan; Solan, Gregory A.; Liang, Tong-Ling; Sun, Wen-Hua

doi:10.1007/s10118-023-3037-9

Cited by 3 publications

(3 citation statements)

References 99 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: Nnn Ligandmentioning

confidence: 99%

“…The two adjacent groups of the benzene ring perpendicular to the metal plane are located, respectively, above and below the plane [108]. The molecular weight of the product can be regulated by modifying the ligand skeleton [109,110] or changing the structure of the benzene ring substituent groups [111]. In addition to the symmetric complexes mentioned above, Xie et al [112] synthesized a series of 2,6-bis(imino)pyridine Fe(II) asymmetric complexes with alkyl and halogen substituents on different aromatic rings.…”

Section: Nnn Ligandmentioning

confidence: 99%

See 1 more Smart Citation

Ethylene Oligomerization Catalyzed by Different Homogeneous or Heterogeneous Catalysts

Peng,

Huang,

2024

Catalysts

View full text Add to dashboard Cite

Linear α-olefins (LAOs) are linear alkenes with double bonds at the ends of the molecular chains. LAOs with different chain lengths can be widely applied in various fields. Ethylene oligomerization has become the main process for producing LAOs. In this review, different homogeneous or heterogeneous catalysts recently reported in ethylene oligomerization with Ni, Fe, Co, Cr, etc., as active centers will be discussed. In the homogeneous catalytic system, we mainly discuss the effects of the molecular structure and the electronic and coordination states of complexes on their catalytic activity and selectivity. The Ni, Fe, and Co homogeneous catalysts are discussed separately based on different ligand types, while the Cr-based homogeneous catalysts are discussed separately for ethylene trimerization, tetramerization, and non-selective oligomerization. In heterogeneous catalytic systems, we mainly concentrate on the influence of various supports (metal–organic frameworks, covalent organic frameworks, molecular sieves, etc.) and different ways to introduce active centers to affect the performance in ethylene oligomerization. Finally, a summary and outlook on ethylene oligomerization catalysts are provided based on the current research. The development of highly selective α-olefin formation processes remains a major challenge for academia and industry.

show abstract

Section: Nnn Ligandmentioning

confidence: 99%

Section: Nnn Ligandmentioning

confidence: 99%

Ethylene Oligomerization Catalyzed by Different Homogeneous or Heterogeneous Catalysts

Peng,

Huang,

2024

Catalysts

View full text Add to dashboard Cite

show abstract

“…As highly active ethylene polymerization/oligomerization catalysts, bis(imino)pyridyl iron catalysts have received intensive attention due to their nontoxic, high metal abundance, and insensitivity to air and moisture. − In contrast to α-diimine nickel/palladium catalysts, bis(imino)pyridyl iron catalysts produced fully linear products. − The demand for bulk ortho -aryl substituents is a crucial factor in suppressing β-H elimination and β-H transfer to monomer, which usually contributes to high-molecular-weight polyethylene with a bimodal distribution due to two chain transfer pathways involving β-H transfer to monomer (high-molecular-weight fraction) and chain transfer to aluminum (low-molecular-weight fraction). , However, bulk ortho -aryl substituents often decrease the activity of bis(imino)pyridyl iron catalyst because the bulky steric hindrance around the metal center hinders the coordination and insertion of ethylene monomers. − …”

Section: Introductionmentioning

confidence: 99%

π–π Interactions-Driven Ethylene Polymerization Using “Sandwich” Bis(imino)pyridyl Iron Catalysts

Cheng,

Gao,

Qiu

et al. 2024

ACS Catal.

View full text Add to dashboard Cite

Weak noncovalent interactions are an effective strategy for modulating catalytic olefin polymerization but have never been observed in bis(imino)pyridyl iron catalysts. In this paper, a series of "sandwich" bis(imino)pyridyl iron complexes with substituted 8-(p-R-phenyl)naphthylamine (R = OMe, Me, H, CF 3 ) were designed and synthesized for ethylene polymerization. The π−π interactions between the capping aryl groups and the pyridyl ring are clearly observed in "sandwich" bis(imino)pyridyl iron complexes by single crystal X-ray diffraction analysis, UV−vis, and photoluminescence (PL) spectra. The intramolecular π−π interactions make the naphthyl rings tilt away from the iron center in the horizontal direction, thereby causing a more open horizontal space within iron complexes for ethylene coordination. Ethylene polymerization results show that π−π interactions are a crucial driving force rather than the electronic effects of ligands. Unprecedentedly, bulky "sandwich" bis(imino)pyridyl iron catalysts produce low-molecular-weight PE with a bimodal distribution, which originates from β-H transfer to monomer modulated by the π−π interactions. Density functional theory (DFT) calculations mechanistically demonstrate that the coordination of ethylene to the iron center is a crucial step in ethylene polymerization.

show abstract

Bis(imino)pyridyliron incorporated with NO2, F and benzhydryl substituents as thermostable precatalysts for vinyl-terminated polyethylenes

Tahir,

Ma,

Mahmood

et al. 2024

Polymer

View full text Add to dashboard Cite

High Temperature Iron Ethylene Polymerization Catalysts Bearing N, N, N′-2-(1-(2,4-Dibenzhydryl-6-fluorophenylimino)ethyl)-6-(1-(arylphenylimino)ethyl)pyridines

Cited by 3 publications

References 99 publications

Ethylene Oligomerization Catalyzed by Different Homogeneous or Heterogeneous Catalysts

Ethylene Oligomerization Catalyzed by Different Homogeneous or Heterogeneous Catalysts

π–π Interactions-Driven Ethylene Polymerization Using “Sandwich” Bis(imino)pyridyl Iron Catalysts

Bis(imino)pyridyliron incorporated with NO2, F and benzhydryl substituents as thermostable precatalysts for vinyl-terminated polyethylenes

Contact Info

Product

Resources

About