Dichloro-Bis(1-Alkyl/Styryl-Benzimidazole)-Cobalt(II) Pre-Catalyst for Ethylene Dimerization
Shaima Hkiri, Neslihan Şahin, Romain Sabourin, Rémi Brandt, İsmail Özdemir, David Sémeril
Organics · pp. 49–49 · Published 4 Nov 2025
10.3390/org6040049Abstract
A series of five cobalt(II) complexes, dichloro-bis(1-benzyl-benzimidazole)-cobalt(II) (1a), dichloro-bis[1-(4-fluorobenzyl)-benzimidazole]-cobalt(II) (1b), dichloro-bis((Z)-1-styryl-benzimidazole)-cobalt(II) (1c), dichloro-bis[(Z)-1-(2-fluorostyryl)-benzimidazole]-cobalt(II) (1d) and dichloro-bis(1-cinnamyl-benzimidazole)-cobalt(II) (1e), were evaluated in ethylene dimerization. Four of these complexes were described for the first time and fully characterized by IR, elemental analysis, mass and NMR spectroscopy. In the solid state, the cobalt atom exhibited a typical tetrahedral geometry and was found to be coordinated to two chlorine atoms and two benzimidazole rings. In the presence of 20 bar of ethylene and diethylaluminium chloride as a co-catalyst, the complex with styryl substituents on the benzimidazole rings, complex 1c, exhibited the highest activity with a turnover frequency of 3430 mol(ethylene)·mol(Co)−1·h−1.
References (29)
- 1 Faheem, 2020, A Review on the modern synthetic approach of benzimidazole candidate [DOI]
- 2 Pashchevskaya, 2010, Effect of the condition of synthesis on the composition and structure of copper(II) complexes with benzimidazole [DOI]
- 3 2008, Synthesis, structure and biological activities of cobalt(II) and zinc(II) coordination compounds with 2-benzimidazole derivatives [DOI]
- 4 2023, Antimicrobial activities of bis-(N-alkylbenzimidazole)-cobalt(II) and zinc (II) complexes [DOI]
- 5 Mota, 2014, Gold complexes with benzimidazole derivatives: Synthesis, characterization and biological studies [DOI]
- 6 Hernández-Toledo, H.C., Flores-Alamo, M., and Castillo, I. (2023). Bis(benzimidazole)amino thio- and selenoether iron(II) complexes as proton reduction electrocatalysts. J. Inorg. Biochem., 241. [DOI]
- 7 Dogan, 2024, Synthesis of palladium complexes containing benzimidazole core and their catalytic activities in direct arylation of heteroaromatic species [DOI]
- 8 Dogan, 2021, Novel benzimidazole-platinum(II) complexes: Synthesis, characterization, antimicrobial and anticancer activity [DOI]
- 9 Karabekmez, 2025, Structural investigation and application of ruthenium(II)-benzimidazole complexes for N-alkylation [DOI]
- 10 Small, 1998, Highly active iron and cobalt catalysts for the polymerization of ethylene [DOI]
- 11 Britovsek, G.J.P., Gibson, V.C., McTavish, S.J., Solan, G.A., White, A.J.P., Williams, D.J., Britovsek, G.J.P., Kimberley, B.S., and Maddox, P.J. (1998). Novel olefin polymerization catalysts based on iron and cobalt. Chem. Commun., 849–850. [DOI]
- 12 Bianchini, 2006, Ethylene oligomerization, homopolymerization and copolymerization by iron and cobalt catalysts with 2,6-(bis-organylimino)pyridyl ligands [DOI]
- 13 Flory, 1940, Molecular size distribution in ethylene oxide polymers [DOI]
- 14 Pelletier, 2006, Electronically variable imino-phenanthrolinyl-cobalt complexes; synthesis, structures and ethylene oligomerisation studies [DOI]
- 15 Bianchini, 2003, Oligomerisation of ethylene to linear α-olefins by new Cs- and C1-symmetric [2,6-bis(imino)pyridyl]iron and -cobalt dichloride complexes [DOI]
- 16 Britovsek, G.J.P., Gibson, V.C., Kimberley, B.S., Mastroianni, S., Redshaw, C., Solan, G.A., White, A.J.P., and Williams, D.J. (2001). Bis(imino)pyridyl iron and cobalt complexes: The effect of nitrogen substituents on ethylene oligomerisation and polymerization. J. Chem. Soc. Dalton Trans., 1639–1644. [DOI]
- 17 Sun, 2002, Controllable supramolecular assembly by π-π interactions: Cobalt(II) and copper(II) complexes with benzimidazole derivatives [DOI]
- 18 Şahin, N., Özdemir, İ., and Sémeril, D. (2024). Dichloro-bis(1-cinnamyl-benzimidazole)-Cobalt(II). Molbank, 2024. [DOI]
- 19 Chakraborty, 2018, An efficient strategy for N-alkylation of benzimidazoles/imidazoles in SDS-aqueous basic medium and N-alkylation induced ring opening of benzimidazoles [DOI]
- 20 Sudakow, 2012, Photochemical arylation of Brønsted acids with 2-azidobenzimidazole [DOI]
- 21 Reddy, 2013, Synthesis of imidazo and benzimidazo [2,1-a]-isoquinolines by rhodium-catalyzed intramolecular double C-H bond activation [DOI]
- 22 Sheldrick, 2015, SHELXT—Integrated space-group and crystal-structure determination [DOI]
- 23 Sheldrick, 2015, Crystal structure refinement with SHELXL [DOI]
- 24 Natarajan, 2018, Cavitand chemistry: Nickel half-sandwich complexes with imidazolylidene ligands bearing one or two resorcinarenyl substituents [DOI]
- 25 Schmidt, 1967, Complexes of cobalt(II). IV. On the electron paramagnetic resonance spectra of some magnetically anomalous complexes of cobalt(II) [DOI]
- 26 Pankratova, 2021, High-Spin cobalt(II) complex with record-breaking anisotropy of the magnetic susceptibility according to paramagnetic NMR spectroscopy data [DOI]
- 27 2020, First used of alkylbenzimidazole-cobalt(II) complexes as a catalyst for the N-alkylation of amines with alcohols under solvent-free medium [DOI]
- 28 Jian, 2004, Synthesis, structures, and spectroscopic characterizations of the α and β forms of bis(N-phenmethyl-benzimidazole-N)dichloro cobalt(II) complex: CoCl2(C7H5N2CH2Ph)2 [DOI]
- 29 Lejeune, 2007, Calix[4]arene-derived nickel diphosphine complexes for LLDPE synthesis via orthogonal tandem and one-pot catalysis [DOI]
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