Citation: Jorge L. S. Milan, Igor S. Oliveir, Pamella A. Dos Santo, Ana K. S. M. Vald, Felipe T. Martin, Danielle Canguss, Rafael P. Das Chagas. Chemical fixation of carbon dioxide to cyclic carbonates catalyzed by zinc(Ⅱ) complex bearing 1,2-disubstituted benzimidazole ligand[J]. Chinese Journal of Catalysis, ;2018, 39(2): 245-249. doi: 10.1016/S1872-2067(17)62992-9 shu

Chemical fixation of carbon dioxide to cyclic carbonates catalyzed by zinc(Ⅱ) complex bearing 1,2-disubstituted benzimidazole ligand

Universidade Federal de Goiás, Instituto de Química, Campus Samambaia, CEP:74690-900 Goiânia, GO Brazil

Received Date: 3 October 2017
Revised Date: 1 December 2017

Fund Project: This work was supported by Fundaç

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.
- Carbon dioxide,
- Cyclic carbonate,
- Zinc complex,
- Benzimidazole ligand,
- Cycloaddition,
- Homogeneous catalysis
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