Chemical fixation of carbon dioxide to cyclic carbonates catalyzed by zinc(II) complex bearing 1,2-disubstituted benzimidazole ligand
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2018
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A new zinc(II) complex of formula [ZnCl2(L1)2] (1) [L1 = 2-(2-thienyl)-1-(2-thienylmethyl)-1H- benzimidazole] was synthesized and fully characterized by nuclear magnetic resonance and infrared spectroscopy, elemental analysis, electrospray ionization high-resolution mass spectrometry, and thermogravimetric analysis. The molecular structure was confirmed by single-crystal X-ray diffraction. Complex 1 consists of mononuclear tetrahedral zinc(II) units with a locked geometry resulting from weak intramolecular S…π and π–π interligand interactions. The benzimidazole ligand and its zinc(II) complex were readily obtained through a simple synthetic route. The catalytic activity of 1 was investigated in the coupling of carbon dioxide with epoxides to produce cyclic carbonates, and a series of parameters were evaluated. The complex efficiently catalyzed the transformation of various epoxides under solvent-free conditions, with good conversions, turnover numbers, and turnover frequencies.
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Carbon dioxide, Cyclic carbonate, Zinc complex, Benzimidazole ligand, Cycloaddition, Homogeneous catalysis
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MILANI, Jorge L. S. et al. Chemical fixation of carbon dioxide into cyclic carbonates catalyzed by a zinc(II) complex bearing 1,2-disubstituted-benzimidazole ligand. Chinese Journal of Catalysis, Amsterdam, v. 39, p. 245-249, 2018. DOI: 10.1016/S1872-2067(17)62992-9. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S1872206717629929?via%3Dihub. Acesso em: 29 set. 2023.