Complex [IrClH{κP,P,Si-Si(Me)(C₆H₄–2-PiPr₂)₂}] (1) showed a remarkable catalytic activity for CO₂ hydrogenation in a DMSO/H₂O solvent system incorporating 1,2-dimethyl-3-butylimidazolium acetate ionic liquid (IL), producing 0.94 M formic acid with initial TOFs up to 1432 h⁻¹ (CO₂/H₂ = 20/40 bar, 30 °C). While the hydrogenation outcome followed dependences upon gas composition, pressure and temperature similar to those of other efficient systems in DMSO/H₂O, the kinetic dependence upon catalyst loading revealed non-linear effects suggestive of relevant IL-catalyst interactions. NMR speciation studies identified two major complexes, [Ir(OCHO)(H){κP,P,Si-Si(Me)(C₆H₄–2-PiPr₂)₂}] (2) and [Ir(H)₂{κP,P,Si-Si(Me)(C₆H₄–2-PiPr₂)₂}(DMSO)] (3), potentially responsible for catalytic cycling though inactive outside the current solvent system.

络合物[IrClH {κP，P，Si-Si（Me）（C ₆ H ₄ –2-P i Pr ₂）₂ }]（1）在DMSO / H ₂ O溶剂中显示出显着的CO ₂加氢催化活性。该系统包含乙酸1,2-二甲基-3-丁基咪唑鎓离子液体（IL），可生产0.94 M甲酸，其初始TOF最高可达1432 h ^-1（CO ₂ / H ₂  = 20/40 bar，30°C）。氢化结果取决于气体成分，压力和温度，与DMSO / H ₂中其他有效系统的结果相似O，对催化剂负载量的动力学依赖性揭示了暗示相关的IL-催化剂相互作用的非线性效应。NMR形态研究确定两个主要络合物，物[Ir（OCHO）（H）{κ P，P，的Si-Si（Me）的（C ₆ H ^ ₄ -2-P我镨₂）₂ }]（2）和物[Ir （H）₂ {κP，P，Si-Si（Me）（C ₆ H ₄ –2-PiPr ₂）₂ }（DMSO）]（3），尽管在当前溶剂系统外不活跃，但可能引起催化循环。