Two Stable Heterometal-MOFs as Highly Efficient and Recyclable Catalysts in the CO₂ Coupling Reaction with Aziridines

Two stable heterometal-organic frameworks, {Na[LnCo(DATP)₂ (Ac)(H₂ O)](NO₃ )⋅DMA⋅11 H₂ O}_n (Ln=Er(1) and Yb(2)), have been prepared with H₂ DATP (4'-(3,5-dicarboxyphenyl)-2,2':6',2'''-terpyridine) as organic building block. These two isostructural compounds featuring two-dimensional layer architectures possess outstanding thermal stabilities and excellent chemical stabilities in common organic solvents and different acid/base solutions with pH range changing from 1 to 13. Moreover, compounds 1 and 2 serving as heterogeneous catalysts can efficiently catalyse the CO₂ fixation reaction with various aziridines to result in corresponding oxazolidinones at 70 °C. Importantly, a good recyclable performance of 1 for at least 10 cycles is observed based on the experimental results, which are further confirmed by PXRD, TGA and ICP analyses.