Abstract
A series of four porphyrin–alkaline earth metal– organic frameworks [Mg(HDCPP)2(DMF)2]n⋅(H2O)7 n (1), [Ca(HDCPP)2(H2O)2]n(DMF)1.5 n (2), [Sr(DCPP)(H2O)(DMA)]n (3), and [Ba(DCPP)(H2O)(DMA)]n (4) was isolated for the first time from solvothermal reaction between metal-free 5,15-di(4- carboxyphenyl)porphyrin (H2DCPP) and alkaline earth ions. Single-crystal X-ray diffraction analysis reveals the 2D and 3D supramolecular network with periodic nanosized porosity for 1/2 and 3/4, respectively. The whole series of MOFs, in particular, compounds 1 and 2 with intrinsic low molecular formula weight, exhibit superior adsorption performance for methylene blue (MB) with excellent capture capacity as represented by the thus far highest adsorption amount of 952 mg g−1 for 2 and good selectivity, opening a new way for the potential application of the main group metal-based MOFs.
