Post-synthetic modification of Isomorphic coordination polymers with metal ion exchange and catalytic cycloaddition of CO2

Abstract

A coordination polymeric crystal 1 was successfully synthesized from H4L (5,5′-(1,4-phenylenebis (methoxy))diisophthalic acid), bidpe (4,4′-bis(lmidazolyl)diphenyl ether), and Zn(NO3)2·6H2O under solvothermal conditions, and characterized by single-crystal X-ray diffraction. Then, two new crystals 1Fe and 1Cu were obtained with metal ion exchange when 1 was dipped into the DMF solution for FeCl2 and CuCl2, respectively. The exchange process demonstrated that the high valence metal ion with strong acidity could be destroyed the structure of the crystals. Therefore, it should be exchanged with lower valence ion and then oxidized to the high valence state, which could be a feasible way to obtain the crystals with high valence metal ions. Further, the magnetic property and the synergistic CO2 conversion with epoxide for 1Fe and 1Cu were also investigated, and the results shown that 1Fe could be regarded as a potential catalyst for this conversion.