Over the past decades, a lot of efforts have been made for the fixation of carbon dioxide (CO₂) into epoxide for the synthesis of industrially important cyclic carbonates. Here, a cobalt(II) complex based on triazole, namely Co(II)-1,2,3-1H-triazole-4-carboxylate, was synthesized, fully characterized by FTIR, NMR, mass spectrometry, and single crystal X-ray diffraction, and used as a catalyst for the cycloaddition of CO₂ to epoxides. The catalytic studies demonstrated that the catalyst is highly active for the CO₂ fixation, with high turnover number (TON, 85 × 10³) even without the use of solvent and at ambient pressure (1 bar) to produce a variety of different cyclic carbonates depending on the epoxide. Remarkably, the catalyst was used continuously further by the addition of a fresh amount of the substrate within the same reaction mixture for at least five successive reaction cycles without any loss in the catalytic activity.

在过去的几十年中，已经进行了很多努力以将二氧化碳（CO ₂）固定为环氧化物，以合成工业上重要的环状碳酸酯。在此，合成了基于三唑的钴（II）配合物，即Co（II）-1,2,3-1 H-三唑-4-羧酸盐，并通过FTIR，NMR，质谱和单晶X进行了全面表征射线衍射，并用作将CO ₂环化成环氧化物的催化剂。催化研究表明，该催化剂对CO ₂固定具有很高的活性，并具有很高的周转率（TON，85×10 ³），即使不使用溶剂，也可以在环境压力（1 bar）下根据环氧化物生产各种不同的环状碳酸酯。值得注意的是，在至少五个连续的反应循环中，在相同的反应混合物中添加新鲜量的底物，从而进一步连续使用催化剂，而催化活性没有任何损失。