In this study, we report newly synthesized S^N^S and Se^N^Se tridentate platinum(II) and palladium(II) pincer complexes. These complexes have been evaluated as pre-catalysts in the hydrogenation of carbon dioxide to formate under basic conditions. These new molecular catalysts proved to be active in forming industrially valuable chemical intermediates like formate and diethylformamide from CO₂. The complexes are soluble in THF and insoluble in water enabling easy catalyst recovery from a biphasic mixture of THF/water solvent system after catalysis. The pincer ligands provide a robust framework for stabilizing the active centers through various catalytic cycle steps. Palladium(II) catalysts yielded formate with TONs as high as 1881, while Se^N^Se platinum(II)-based catalysts (C1, C2, and C3) catalyzed the hydrogenation of CO₂ to formate at TONs of 550, 421, and 1254, respectively, after 24 h. Similarly, the N-formylation of diethylamine using CO₂ and H₂ in the presence of C2 is effective with yields up to 71 %.

在这项研究中，我们报告了新合成的 S^N^S 和 Se^N^Se 三齿铂 (II) 和钯 (II) 钳形配合物。这些配合物已被评估为在碱性条件下将二氧化碳加氢成甲酸盐的预催化剂。事实证明，这些新型分子催化剂在从 CO ₂形成具有工业价值的化学中间体（如甲酸盐和二乙基甲酰胺）方面具有活性。该配合物可溶于四氢呋喃，不溶于水，因此在催化后可从四氢呋喃/水溶剂体系的双相混合物中轻松回收催化剂。钳状配体通过各种催化循环步骤为稳定活性中心提供了强大的框架。钯 (II) 催化剂产生的甲酸盐的 TON 高达 1881，而 Se^N^Se 铂 (II) 基催化剂 ( C1 ,24 小时后，C2和C3 )分别以 550、421 和 1254 的 TON催化 CO ₂氢化成甲酸盐。类似地，在C2存在下使用CO ₂和H ₂对二乙胺进行N-甲酰化是有效的，产率高达71%。