Syntheses, Structural Diversity, And Photocatalytic-Degradation Properties For Methylene Blue Of Co(Ii) And Ni(Ii) Mofs Based On Terephthalic Acid And Different Imidazole Bridging Ligands

Six coordination polymers named [Co(TPA)(bimb)(H2O)(2)](n) (1), [Co(TPA)(4,4 '-bidpe)](n) (2), [Co(TPA)(4,4 '-bibp)](n) (3), [Co-4(TPA)(3)(tib)(2)(mu(3)-OH)(2)](n) (4), [Ni(TPA)(4,4 '-bidpe)(H2O)(2)](n) (5), and [Ni-2(TPA)(2)(4,4 '-bibp)(3)(H2O)(2)](n) (6) (TPA = terephthalic acid, bimb = 1,4-bis(imidazol)butane, 4,4 '-bidpe = 4,4 '-bis(imidazolyl)diphenyl ether 4,4 '-bibp = 4,4 '-bis(imidazolyl)biphenyl, and tib = 1,3,5-tris(1-imidazolyl)benzene) were constructed using a solvothermal method and characterized by X-ray diffraction, elemental analyses, infrared spectroscopy and thermogravimetric analysis. Complex 1 had a 3D supermolecular framework that crystallized in the monoclinic space group P2(1)/c. Complex 2 crystallized in the tetragonal system I4(1)/acd space group featuring a 2-fold interpenetrated framework. Complex 3 crystallized in the orthorhombic space group Pnna. Complex 4 exhibited a 3D Co(ii) metal-organic framework with tetranuclear metal-oxygen clusters, and it crystallized in the monoclinic space group C2/c. Complex 5 crystallized in the monoclinic space group P2(1)/n featuring a 3D supermolecular framework. Complex 6 had a 3D 3-fold interpenetrated fsc topological framework that crystallized in the triclinic space group P1. The photocatalytic-degradation capacity of complex 1-6 for methylene blue (MB) was investigated: complex 1-4 had a better photocatalytic-degradation effect for MB.