The silicon-based materials with enriched superficial Si–OH groups are candidates in the field of the cycloaddition of CO₂ to epoxide to cyclic carbonate; meanwhile, the triazine ring with a nitrogen-rich structure has shown a high adsorption affinity toward CO₂ to polarize CO₂. On this basis, a metal-free triazine-incorporated organosilica framework (SiTIOF) containing triazine rings, −NH, and Si–OH was prepared by substitution reaction and then a hydrothermal method. The prepared SiTIOF exhibited an outstanding catalytic activity for the cycloaddition of CO₂ to epoxide with the cocatalyst tetrabutylammonium bromide (Bu₄NBr) due to the triazine unit and multiple hydrogen bond donors (−NH, −OH). Besides, the SiTIOF catalyst could be reused six times and has good versatility to various epoxides with CO₂ cycloaddition. Moreover, the possible reaction mechanism with a hydrogen bond donor (HBD) and halide anion synergistic catalysis was proposed.

中文翻译：

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不含金属的三嗪结合有机硅骨架催化剂，用于在无溶剂条件下将CO ₂环化成环氧化物

具有丰富的表面Si-OH基团的硅基材料是CO ₂与环氧化物环加成环状碳酸酯领域的候选材料。与此同时，具有富氮结构与三嗪环显示出朝向CO高吸附亲合性₂极化CO ₂。在此基础上，先通过取代反应再通过水热法制备了含有三嗪环，-NH和Si-OH的无金属三嗪结合有机硅骨架（SiTIOF）。将制备的SiTIOF展出CO的环加成的杰出的催化活性₂至环氧化物与助催化剂四丁基溴化铵（BU ₄NBr）是由于三嗪单元和多个氢键供体（-NH，-OH）。此外，SiTIOF催化剂可重复使用六次，并且通过CO ₂环加成反应对各种环氧化物具有良好的通用性。此外，提出了与氢键供体（HBD）和卤化物阴离子协同催化的可能反应机理。