Some Novel Cobalt Diphenylphosphine Complexes: Synthesis, Characterization, and Behavior in the Polymerization of 1,3-Butadiene

Ricci, Giovanni; Leone, Giuseppe; Zanchin, Giorgia; Palucci, Benedetta; Forni, Alessandra; Sommazzi, Anna; Masi, Francesco; Zacchini, Stefano; Guelfi, Massimo; Pampaloni, Guido

doi:10.3390/molecules26134067

Cited by 3 publications

(3 citation statements)

References 25 publications

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Section: Resultsmentioning

confidence: 71%

“…Obviously, this equilibrium will be more shifted toward MAO as the MAO/Fe ratio increases, and this could account for the 1,2 content decreasing with the increasing MAO/Fe molar ratio. In our opinion, the results obtained in the polymerization of 1,3-butadiene with some cobalt phosphine complexes containing donor heteroatoms within the phosphine structure support this interpretation; the syndiotacticity shows a significant increase with decreasing the polymerization temperature (cfr. entries 4 and 5 in Table ), and such a behavior was not surprising because it was also detected in the polymerization of 1,3 dienes with several catalysts based on well-defined transition metal complexes with phosphorus and nitrogen ligands; the molecular weight of the resultant polymers is in general very high and the molecular weight distribution quite narrow and unimodal (1.9 < M w / M n < 3.5), suggesting a single site nature of the catalysts. …”

Section: Resultsmentioning

confidence: 71%

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Highly Stereoregular 1,3-Butadiene and Isoprene Polymers through Monoalkyl-N-Aryl-Substituted Iminopyridine Iron Complex-Based Catalysts: Synthesis and Characterization

Ricci¹,

Leone²,

Zanchin³

et al. 2021

Macromolecules

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Some novel monoalkyl-N-aryl-substituted iminopyridine iron chloride complexes, differing in the nature of the substituent at the iminic carbon and at the ortho position of the aryl ring, were synthesized and characterized. For one of them, single crystals were obtained, which allowed for the determination of its crystalline structure, in which the iron center is coordinated to the chlorides and to the two nitrogen atoms of the ligand. The coordination around iron is distorted tetrahedral, a coordination mode rarely identified for FeCl2 adducts with bidentate nitrogen ligands. All the complexes were used, in combination with methylaluminoxane, for the polymerization of 1,3-butadiene and isoprene, providing syndiotactic 1,2 poly(1,3-butadiene)s and poly(isoprene)s with a predominantly cis-1,4/3,4 alternating structure, in which short cis-1,4 sequences of three or five units, whose length depends on the nature of the ligand on the iron atom, are present. A detailed NMR characterization (1H-, 13C-, and 2D experiments) of the resultant poly(isoprene)s is reported, and a tentative scheme for the formation of the novel isoprene polymers is proposed.

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Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 71%

Highly Stereoregular 1,3-Butadiene and Isoprene Polymers through Monoalkyl-N-Aryl-Substituted Iminopyridine Iron Complex-Based Catalysts: Synthesis and Characterization

Ricci¹,

Leone²,

Zanchin³

et al. 2021

Macromolecules

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“…Moreover, a wide range of ligands has been designed and applied in the catalytic polymerization of conjugated dienes using late transition metal catalysts. 2,12–33…”

Section: Introductionmentioning

confidence: 99%

Ultrahigh activity and broad temperature resistance of amine–imine cobalt precatalysts for butadiene polymerization

Fu,

Tang,

Hua

2023

Dalton Trans.

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Applications of Cobalt Complexes in Olefin Polymerization

Lianrong¹,

Wang²,

Jiang³

et al. 2022

Chinese Journal of Organic Chemistry

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Polyolefin materials have huge annual output and wide applications, which are closely related to human production and life closely. The core of polyolefin research lies in the catalyst, the performance of which often determines the properties of polyolefins. Therefore, the design and synthesis of high-performance catalyst have become a hot research topic, and a large number of catalysts have come out. Cobalt complexes are very important kind of olefin polymerization catalysts, which can be used to catalyze a variety of monomer polymerization. These cobalt complexes are structure diversity and have a variety of coordination atoms (such as, N, O, P, S etc.), and the synthesis is relatively simple. Therefore, the structure of the catalyst can be precisely regulated to improve the catalytic activity, adjust the microstructure of the polymer, and improve the macroscopical properties of the polymer. In this paper, the applications of cobalt complexes in homopolymerization of ethylene, conjugated dienes, norbornene, acrylates and other common monomers are reviewed, and the cobalt complexes are classified from the perspective of structure. What's more, the effects of catalyst structure, temperature, cocatalyst on catalyst activity, polymer molecular weight and polymer microstructure are discussed in detail. It is expected to provide a reference for the design and synthesis of cobalt complexes in the future.

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Some Novel Cobalt Diphenylphosphine Complexes: Synthesis, Characterization, and Behavior in the Polymerization of 1,3-Butadiene

Cited by 3 publications

References 25 publications

Highly Stereoregular 1,3-Butadiene and Isoprene Polymers through Monoalkyl-N-Aryl-Substituted Iminopyridine Iron Complex-Based Catalysts: Synthesis and Characterization

Highly Stereoregular 1,3-Butadiene and Isoprene Polymers through Monoalkyl-N-Aryl-Substituted Iminopyridine Iron Complex-Based Catalysts: Synthesis and Characterization

Ultrahigh activity and broad temperature resistance of amine–imine cobalt precatalysts for butadiene polymerization

Applications of Cobalt Complexes in Olefin Polymerization

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