Synthesis, characterization, and butadiene polymerization of iron(III), iron(II) and cobalt(II) chlorides bearing 2,6-bis(2-benzimidazolyl)pyridyl or 2,6-bis(pyrazol)pyridine ligand

Gong, Dirong; Jia, Xiaoyu; Wang, Baolin; Zhang, Xuequan; Jiang, Liansheng

doi:10.1016/j.jorganchem.2011.11.025

Cited by 77 publications

(29 citation statements)

References 63 publications

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“…In order to gain better control over molecular weight, molecular weight distribution, and, more importantly, stereoselectivity of the polymerization, academic and industrial research has focused on well-defined organometallic single-site catalysts. For example, four-coordinated (salen)cobalt(II) ([ONNO] 2− ) [ 7 ] and bis(salicylaldiminate)cobalt(II) [ 8 ], three-coordinated bis(imino)pyridine cobalt (II) [ 9 ], bis(benzimidazolyl)amine cobalt (II) [ 10 ], bis(benzimidazolyl) pyridine [ 11 , 12 ] cobalt(II), bis(thiazolinyl)pyridine cobalt(II) [ 13 ], 2-arylimino-6-(alcohol)pyridine/2-arylamino-6-(alcohol) pyridine cobalt(II) [ 14 ], and 3-aryliminomethyl-2-hydroxybenzaldehyde cobalt(II) [ 15 ] exhibited high activity and high cis -1,4 selectivity in 1,3-butadiene polymerization in combination with MAO or EASC. The nickel-based catalysts are also of particular interest in the production of high cis -1,4-PBD.…”

Section: Introductionmentioning

confidence: 99%

Iminopyridine-Based Cobalt(II) and Nickel(II) Complexes: Synthesis, Characterization, and Their Catalytic Behaviors for 1,3-Butadiene Polymerization

et al. 2016

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A series of iminopyridine ligated Co(II) (1a-7a) and Ni(II) (1b-7b) complexes were synthesized. The structures of complexes 3a, 4a, 5a, 7a, 5b, and 6b were determined by X-ray crystallographic analyses. Complex 3a formed a chloro-bridged dimer, whereas 4a, 5a, and 7a, having a substituent (4a, 5a: CH 3 ; 7a: Br) at the 6-position of pyridine, producing the solid structures with a single ligand coordinated to the central metal. The nickel atom in complex 5b features distorted trigonal-bipyramidal geometry with one THF molecule ligating to the metal center. All the complexes activated by ethylaluminum sesquichloride (EASC) were evaluated in 1,3-butadiene polymerization. The catalytic activity and selectivity were significantly influenced by the ligand structure and central metal. Comparing with the nickel complexes, the cobalt complexes exhibited higher catalytic activity and cis-1,4-selectivity. For both the cobalt and nickel complexes, the aldimine-based complexes showed higher catalyst activity than their ketimine counterparts.

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Section: Introductionmentioning

confidence: 99%

Iminopyridine-Based Cobalt(II) and Nickel(II) Complexes: Synthesis, Characterization, and Their Catalytic Behaviors for 1,3-Butadiene Polymerization

et al. 2016

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“…Similarly to Pd2, palladium complexes with ligands similar to Pd3 have found some applications as catalysts for Suzuki-type reactions. 63 Additionally this ligand has been explored in several other coordination compounds, including lanthanides, [64][65][66] cobalt, 67 ruthenium, 68 platinum, 69 and chromium. 70 Mansour et al described the photoactivated carbon monoxide (CO) releasing properties of ruthenium carbonyl complexes with this ligand.…”

Section: Resultsmentioning

confidence: 99%

Metal Complexes as Antifungals? – From a Crowd-Sourced Compound Library to First In Vivo Experiments

Frei

Elliott

Kan

et al. 2022

Preprint

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There are currently fewer than ten antifungal drugs in clinical development, but new fungal strains, which are resistant to most current antifungals are spreading rapidly across the world. To prevent a second resistance crisis, new classes of antifungal drugs are urgently needed. Metal complexes have proven to be promising candidates for novel antibiotics, but so far, few compounds have been explored for their potential application as antifungal agents. In this work we report the evaluation of 1039 metal-containing compounds that were screened by the Community for Open Antimicrobial Drug Discovery (CO-ADD). We show that 20.9% of all metal compounds tested have antimicrobial activity against two representative Candida and Cryptococcus strains, compared with only 1.1% of the >300,000 purely organic molecules tested through CO-ADD. We identified 90 metal compounds (8.7%) that show antifungal activity while not displaying any cytotoxicity against mammalian cell lines or haemolytic properties at similar concentrations. The structures of 21 metal complexes which display high antifungal activity (MIC ≤ 1.25 µM) are discussed and evaluated further against a broad panel of yeasts. Most of these have not been evaluated for antifungal activity. Eleven of these metal complexes were tested for toxicity in the Galleria mellonella moth larvae model, revealing that only one compound showed signs of toxicity at the highest injected concentration. Lastly, we demonstrated that the organo-Pt(II) cyclooctadiene complex Pt1 significantly reduces fungal load in an in vivo G. mellonella infection model. These findings showcase that the structural and chemical diversity of metal-based compounds can be an invaluable tool in the development of new drugs against infectious diseases.

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“…In the literature [2][3][4][5][6][7], can be found many examples of catalysts mixed with nonmetallocene systems based on transition metal complexes containing diimine ligands (with Ni, Pd and Cu), phenoxy-imine ligands (with Ni, V, Cr, Ti, Zr and Hf), diimine-pyridine ligands (with Fe and Co), diamide ligands (with Ti and Zr), diamide-ether ligands (with Ti, Zr and Hf), diamide-amine ligands (with Ti, Zr and Hf), phosphine -imide ligands (with Ti), bis (phenoxyamine) ligands (with Ti, Zr and Hf), bis (phenoxy) -thioether ligands (with Ti, V), Tris (pyrazolyl) borate ligands (with Ti), pyrrolide -imine ligands (with Ti, Zr and Hf), indolide imine ligands (with Ti) [8][9][10][11][12][13][14][15], phenoxyimide ligands (with V), phenoxy-cyclopentadienyl ligands (with Ti), amidine cyclopentadienyl ligands (with Zr), quinoline-cyclopentadienyl ligands (with Cr), anilide-tropone ligands (with Ni) and amidepyridine ligands (with Ti, Zr). Many of these catalysts show activity not less than metallocene catalysts [16][17][18][19][20][21].…”

Section: Resultsmentioning

confidence: 99%

Polymerization of Ethylene in the Presence of Various Ligand Organometallic Catalytic Systems

Zeynab

Akber

Hemide

et al. 2020

AJOPACS

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This work presents the results on the preparation of new readily available zirconium-containing arylimine complex catalytic systems and their application together with metallocenes in ethylene polymerization. For this purpose, zirconium complexes with grafted ionic liquid type ligands were synthesized and tested in the ethylene polymerization process. On the other hand, it is known that one of the main industrial catalysts for the polymerization process of ethylene is dicycopentadienyl titanium and zirconium dichloride. Therefore, one of the main objectives of the work is to test the using of the newly synthesized complexes with the industrial Cp2TiCl2 catalyst. The products obtained were identified by various physicochemical methods and it was found that these catalytic systems allow one to control the structure and composition of the products obtained.

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Synthesis, characterization, and butadiene polymerization of iron(III), iron(II) and cobalt(II) chlorides bearing 2,6-bis(2-benzimidazolyl)pyridyl or 2,6-bis(pyrazol)pyridine ligand

Cited by 77 publications

References 63 publications

Iminopyridine-Based Cobalt(II) and Nickel(II) Complexes: Synthesis, Characterization, and Their Catalytic Behaviors for 1,3-Butadiene Polymerization

Iminopyridine-Based Cobalt(II) and Nickel(II) Complexes: Synthesis, Characterization, and Their Catalytic Behaviors for 1,3-Butadiene Polymerization

Metal Complexes as Antifungals? – From a Crowd-Sourced Compound Library to First In Vivo Experiments

Polymerization of Ethylene in the Presence of Various Ligand Organometallic Catalytic Systems

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