Abstract
Based on the ligand H2dpPzda (1), a novel cobalt complex [Co(H2dpPzda)(NCS)2]·CH3OH(2) has been synthesized and characterized. The Complex 2 exhibited excellent catalytic performance for converting CO2 into cyclic carbonates under mild conditions. For propylene oxide (PO) and CO2 synthesis of propylene carbonate (PC), the catalytic system showed a remarkable TOF as high as 29,200 h−1. The catalytic system also showed broad substrate scope of epoxide. Additionally, the catalyst could be recycled to maintain the integrity of the structure and remained equal to the level of its catalytic activity even after seven catalytic rounds. Additionally, a possible catalytic mechanism was proposed due to the high catalytic activity which might be owing to the synergism of Lewis acidic metal centers and N group.
Highlights
As one of the main gases that produce the greenhouse effect, CO2 destroys the ecological balance of nature and threatens the survival of various organisms
Metal complexes show superiority due to their easy-to-synthetize, high stability, and abundant spatial structure. It has been reported in the past that most of the catalysts for converting CO2 into cyclic carbonates are insufficient, such as harsh reaction conditions, excessive catalyst loading, and the need for solvent to be added
It is urgently needed to synthesize catalysts with more stable, higher recyclability that can work under milder reaction conditions
Summary
As one of the main gases that produce the greenhouse effect, CO2 destroys the ecological balance of nature and threatens the survival of various organisms. The cycloaddition reaction of epoxide and CO2 is generally carried out over various catalysts, including metal complexes [6,7,8], metal oxides [9], molecular sieves [10], ionic liquids [11,12] and organic catalysts [13,14,15] Among these catalysts, metal complexes show superiority due to their easy-to-synthetize, high stability, and abundant spatial structure. Metal complexes show superiority due to their easy-to-synthetize, high stability, and abundant spatial structure It has been reported in the past that most of the catalysts for converting CO2 into cyclic carbonates are insufficient, such as harsh reaction conditions, excessive catalyst loading, and the need for solvent to be added. It is urgently needed to synthesize catalysts with more stable, higher recyclability that can work under milder reaction conditions
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