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Molecules 2018, 23(9), 2304; https://doi.org/10.3390/molecules23092304

New Coordination Complexes Based on the 2,6-bis[1-(Phenylimino)ethyl] Pyridine Ligand: Effective Catalysts for the Synthesis of Propylene Carbonates from Carbon Dioxide and Epoxides

1
School of Chemistry and Chemical Engineering, Xi’an Shiyou University, Xi’an 710065, China
2
Department of Chemistry, Nankai University, TianJin 300071, China
*
Author to whom correspondence should be addressed.
Received: 12 July 2018 / Revised: 21 August 2018 / Accepted: 30 August 2018 / Published: 10 September 2018
(This article belongs to the Special Issue Scorpionate Ligands: Ever-Young Chemistry Tools)
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Abstract

We aimed to develop new effective catalysts for the synthesis of propylene carbonate from propylene oxide and carbon dioxide. A kind of Mx+LClx coordination complex was fabricated based on the chelating tridentate ligand 2,6-bis[1-(phenylimino)ethyl] pyridine (L). The obtained products were characterized by elemental analysis, infrared spectroscopy, ultraviolet spectroscopy, thermogravimetric analysis, and single-crystal X-ray diffraction. It was found that the catalytic activity of the complexes with different metal ions, the same ligand differed and co-catalyst, where the order of greatest to least catalytic activity was 2 > 3 > 1. The catalytic system composed of complex 2 and DMAP proved to have the better catalytic performance. The yields for complex 2 systems was 86.7% under the reaction conditions of 100 °C, 2.5 MPa, and 4 h. The TOF was 1026 h1 under the reaction conditions of 200 °C, 2.5 MPa, and 1 h. We also explored the influence of time, pressure, temperature, and reaction substrate concentration on the catalytic reactions. A hypothetical catalytic reaction mechanism is proposed based on density functional theory (DFT) calculations and the catalytic reaction results. View Full-Text
Keywords: coordination complexes; carbon dioxide; catalyst for propylene carbonate; DFT calculations coordination complexes; carbon dioxide; catalyst for propylene carbonate; DFT calculations
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Xia, L.; Wang, W.-Z.; Liu, S.; Jia, X.-G.; Zhang, Y.-H.; Li, L.-L.; Wu, Y.; Su, B.-Y.; Geng, S.-B.; Fan, W. New Coordination Complexes Based on the 2,6-bis[1-(Phenylimino)ethyl] Pyridine Ligand: Effective Catalysts for the Synthesis of Propylene Carbonates from Carbon Dioxide and Epoxides. Molecules 2018, 23, 2304.

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