Synthesis, characterization and olefin polymerization studies of iron(II) and cobalt(II) catalysts bearing 2,6-bis(pyrazol-1-yl)pyridines and 2,6-bis(pyrazol-1-ylmethyl)pyridines ligands

Karam, Arquı́medes; Catarı́, Edgar; López-Linares, Francisco; Agrifoglio, Giuseppe; Albano, Carmen; Díaz-Barrios, Antonio; Lehmann, Teresa; Pékerar, Sara; Albornoz, Luis A.; Atencio, Reinaldo; González, Teresa; Ortega, Heriberto; Joskowics, Pablo

doi:10.1016/j.apcata.2004.10.047

Cited by 63 publications

(40 citation statements)

References 33 publications

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“…Similar behaviour has been reported [30,35,36], which explained by the presence of triisobutylaluminoxane in MMAO and could generate sterically bulk species that hinder the insertion of ethylene.…”

Section: Ethylene Polymerizationsupporting

confidence: 78%

“…The molecular weights of polymer produced were high (0.7-1.4) 9 10 6 g mol -1 in all runs performed, which is similar or higher than those reported for related systems [36,37].…”

Section: Polymer Characterizationsupporting

confidence: 75%

“…The results obtained with 1-3/MAO catalytic systems show higher or comparable activity than those reported analogues under the conditions reported here [36,37].…”

Section: Ethylene Polymerizationsupporting

confidence: 67%

“…Little attention has been paid to tridentate nitrogenbased ligand such as pyrazole and pyrazolyl ligands in ethylene oligomerization and polymerization [22][23][24][25][26][27][28][29][30]. Therefore, a combination of pyridyl and pyrazolyl units produces other types of tridentate ligands [31], such as 2,6-bis(pyrazol-1-yl)pyridine.…”

Section: Introductionmentioning

confidence: 99%

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Bis(Pyrazolyl)Pyridine Late Transition Metal Complexes as Single-Site Catalysts for Ethylene Polymerization to Highly Linear Polyethylene

Abbo

Titinchi

2010

Catal Lett

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The synthesis, characterization of the halide complexes LMX n (M = Co (1), Fe (2); X = Cl; n = 2); (M = Ni (3), X = Br, n = 2) bearing 2,6-bis(3,5-dimethylpyrazol-1-ylmethyl)pyridine ligand (L) and ethylene polymerization behaviour of these complexes are described. Complexes 1-3 display reasonable activity for ethylene polymerization on treatment with activated methylaluminoxane (MAO), produce single-site catalysts that polymerized ethylene to highly linear polyethylene (PE). Molecular weights (M w ) of the polymers produced are in the range (0.7-1.4) 9 10 6 g mol -1 with relatively narrow molecular weight distribution (2.1-2.8).

show abstract

Section: Ethylene Polymerizationsupporting

confidence: 78%

“…The molecular weights of polymer produced were high (0.7-1.4) 9 10 6 g mol -1 in all runs performed, which is similar or higher than those reported for related systems [36,37].…”

Section: Polymer Characterizationsupporting

confidence: 75%

“…The results obtained with 1-3/MAO catalytic systems show higher or comparable activity than those reported analogues under the conditions reported here [36,37].…”

Section: Ethylene Polymerizationsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

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Bis(Pyrazolyl)Pyridine Late Transition Metal Complexes as Single-Site Catalysts for Ethylene Polymerization to Highly Linear Polyethylene

Abbo

Titinchi

2010

Catal Lett

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“…[6,8] However, these complexes are less explored for the polymerization of unsaturated alkenes. [9] In this paper, we report the syntheses and crystal Two new copper(I) complexes, [Cu(bdmpm) 2 ](PF 6 ) (1) [bis(3,5-dimethyl-1H-pyrazol-1-yl)-methane (bdmpm)] and [Cu(m-bdmpp)(MeCN)] 2 (PF 6 ) 2 (2) [2,6-bis(3,5-dimethyl-1H-pyrazol-1-yl)-pyridine (bdmpp)], were prepared by reactions of [Cu(MeCN) 4 ](PF 6 ) with bdmpm or bdmpp in MeCN. X-ray analysis revealed that 1 is a mononuclear complex with the central Cu being chelated by two bdmpm ligands.…”

Section: Introductionmentioning

confidence: 99%

Two Cationic Copper(I) Catalysts with N‐Donor Ligands for the Polymerization of Methyl Methacrylate

Liu

Ren

et al. 2009

Macro Chemistry & Physics

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Two new copper(I) complexes, [Cu(bdmpm)2](PF6) (1) [bis(3,5‐dimethyl‐1H‐pyrazol‐1‐yl)methane (bdmpm)] and [Cu(µ‐bdmpp)(MeCN)]2(PF6)2 (2) [2,6‐bis(3,5‐dimethyl‐1H‐pyrazol‐1‐yl)pyridine (bdmpp)], were prepared by reactions of [Cu(MeCN)4](PF6) with bdmpm or bdmpp in MeCN. X‐ray analysis revealed that 1 is a mononuclear complex with the central Cu being chelated by two bdmpm ligands. 2 has a double‐stranded helicate structure in which each of the two [Cu(µ‐bdmpp)(MeCN)]+ cations is linked by the other bdmpp ligand. Both 1 and 2 exhibited high catalytic activity in the polymerization of methyl methacrylate (MMA). Even though the ratio of MMA to catalyst was raised up to 1 000:1, the PDI for 1 (reaction time was fixed at 5 h) is below 1.6 and the conversion is up to 66.0% while that for 2 (reaction time was fixed at 6 h) is below 1.5 and the conversion is up to 75.2%. In addition, the effects of solvents, reaction temperatures as well as ratios of MMA to catalyst were also investigated.

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Nickel(II) complexes bearing pyrazolylpyridines: synthesis, structures and ethylene oligomerization reactions

Nyamato

Alam

Ojwach

et al. 2015

Applied Organom Chemis

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Reactions of 2-bromo-6-(3,5-dimethyl-1H-pyrazol-1-yl)pyridine (L1) and 2,6-bis(3,5-dimethyl-1H-pyrazol-1-yl)pyridine (L2) with NiCl 2 and NiBr 2 led to the formation of their respective metal complexes [NiCl 2 (L1)] (1), [NiBr 2 (L1)] (2) and [NiBr 2 (L2)] (3) in moderate to high yields. The complexes were characterized using elemental analyses, mass spectrometry and singlecrystal X-ray diffraction for 2. The solid-state structure of 2 confirmed the bidentate coordination mode of L1 and formation of a monometallic compound. Activation of the nickel(II) pre-catalysts with methylaluminoxane afforded active catalysts in the ethylene oligomerization reaction to produce mainly butenes (84-86%). In contrast, activation of nickel(II) pre-catalyst 2 with ethylaluminium dichloride resulted in partial Friedel-Crafts alkylation of the toluene solvent by the preformed oligomers. Complex structure, nature of co-catalyst employed, type of solvent and reaction conditions influenced the catalytic behaviour of these pre-catalysts.

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Synthesis, characterization and olefin polymerization studies of iron(II) and cobalt(II) catalysts bearing 2,6-bis(pyrazol-1-yl)pyridines and 2,6-bis(pyrazol-1-ylmethyl)pyridines ligands

Cited by 63 publications

References 33 publications

Bis(Pyrazolyl)Pyridine Late Transition Metal Complexes as Single-Site Catalysts for Ethylene Polymerization to Highly Linear Polyethylene

Bis(Pyrazolyl)Pyridine Late Transition Metal Complexes as Single-Site Catalysts for Ethylene Polymerization to Highly Linear Polyethylene

Two Cationic Copper(I) Catalysts with N‐Donor Ligands for the Polymerization of Methyl Methacrylate

Nickel(II) complexes bearing pyrazolylpyridines: synthesis, structures and ethylene oligomerization reactions

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