Present manuscript deals with the comprehensive solventless coupling of carbon dioxide and epoxides to yield cyclic carbonates catalyzed by cobalt complex [Co-HPEED]. Different spectroscopic techniques are used to characterize this cobalt complex, which confirm its square planar geometry. The cobalt complex shows high catalytic activity toward the formation of cyclic carbonates. We found that the types of co-catalysts, temperature and time affect the rate of formation of cyclic carbonates to great extent. Finally, a mechanism appropriate for the formation of cyclic carbonates has been given based on our experimental results.

中文翻译：

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钴（II）络合物催化的CO 2和环氧化物的无溶剂偶联

本手稿涉及二氧化碳和环氧化物的全面无溶剂偶联，以产生钴配合物[Co-HPEED]催化的环状碳酸酯。使用不同的光谱技术来表征这种钴配合物，从而确认了其方形平面几何形状。钴配合物显示出对形成环状碳酸酯的高催化活性。我们发现助催化剂的类型，温度和时间在很大程度上影响环状碳酸酯的形成速率。最后，根据我们的实验结果，给出了适合形成环状碳酸酯的机理。