A series of Salen-Co(II) complexes were synthesized to study the effect of O₂ on the catalytic performance of Salen-Co complexes for the copolymerization of PO/CO₂. The Salen-Co(II) complexes showed low activity on the cyclo-addition of CO₂ to PO with the aid of a cocatalyst such as PPNCl. Unexpectedly, with the addition of O₂, the activity of Salen-Co(II) complexes was obviously increased and 100% cyclic carbonate was obtained. As the pressure of O₂ increased, the activity of the complex also increased. With the existence of O₂, the activity of the complexes was influenced by their structures and the pressure of O₂, and the complexes with the conjugated structure showed higher activity. The structures of cocatalyst also played a crucial role as for the change of the activity. By altering the electrophilicity of Salen-Co(III), O₂ can also be used as cocatalyst for the copolymerization of PO/CO₂.

合成了一系列Salen-Co（II）配合物，以研究O ₂对Salen-Co配合物催化PO / CO ₂的催化性能的影响。Salen-Co（II）配合物在助催化剂（如PPNCl）的辅助下将CO ₂环加到PO中表现出较低的活性。出乎意料的是，加入O ₂，Salen-Co（II）配合物的活性明显增加，并获得了100％的环状碳酸酯。随着O ₂压力的增加，配合物的活性也增加。随着O ₂的存在，配合物的活性受其结构和O ₂压力的影响。，并且具有共轭结构的复合物显示出更高的活性。助催化剂的结构对于活性的变化也起着至关重要的作用。通过改变Salen-Co（III）的亲电性，O ₂也可用作助催化剂用于PO / CO ₂的共聚。