Two new dioxovanadium(+5) complexes, one anionic and other neutral, have been synthesized and characterized by X-ray crystallography in this work. While doing cycloaddition reaction of CO₂ to epoxides, taking dioxovanadium(+5) complex as the catalyst, a blue vanadium complex was generated in situ, which was found to be the active catalyst, showing excellent catalytic activity in the presence of tetrabutylammonium bromide as the co-catalyst. The catalytic activity of the catalyst system is enhanced by moisture and, on the other hand, is retarded by atmospheric oxygen. The enhanced catalytic activity at moistened conditions shows the applicability of the catalyst for CO₂ fixation from wet flue gas. However, the retarded catalytic activity caused by atmospheric oxygen is important from the mechanistic point of view.

中文翻译：

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由二氧钒（+5）配合物原位形成的蓝色钒催化剂催化的高效环氧乙烷固定环氧化物：水分增加和大气中的氧气延迟了催化活性

在这项工作中，已经合成了两种新的二氧钒钒（+5）配合物，一种是阴离子型，另一种是中性的。以二氧钒（+5）配合物为催化剂，进行CO ₂与环氧化物的环加成反应时，原位生成蓝色钒配合物，被发现是一种活性催化剂，在四丁基溴化铵存在下表现出优异的催化活性。助催化剂。湿气增强了催化剂体系的催化活性，另一方面，大气中的氧气阻碍了它的催化活性。在潮湿条件下增强的催化活性表明该催化剂适用于CO ₂从湿烟气中固定。然而，从机理的观点来看，由大气氧引起的催化活性的降低是重要的。