3d-4f Heterometal–Organic Frameworks for Efficient Capture and Conversion of CO₂

Two novel three-dimensional 3d-4f heterometallic-organic frameworks {[TbZn­(BPDC)₂­(μ₂-H₂O)­Cl­(H₂O)₃]­·5H₂O­·0.5DMA}_n (1) and {[TbCo­(BPDC)₂­(μ₂-H₂O)­Cl­(H₂O)₃]­·8H₂O­·0.5DMA}_n (2) have been synthesized and structurally characterized. They are isostructural and exhibit irregular one-dimensional channels with a large potential pore volume. Importantly, both of them demonstrate excellent catalytic activity for the chemical fixation of CO₂ into cyclic carbonates under mild conditions. Moreover, the catalytic recycling of compound 1 as a representative example was explored; it can be easily separated and reused for at least four times without significant reduction in catalytic ability.