Two novel metal-organic frameworks constructed by pyridinyl-derived and carboxylate mixed ligands for photocatalytic dye degradation

A new rigid bipyridinyl-derived ligand has been utilized for the fabrication of two metal-organic frameworks, denoted as [M(L)(mipa)](n) [M = Zn (1) and Cd (2), L = 2,6-bis((E)-4-(pyridine-3-yl)benzylidene)cyclohexanone, H(2)mipa = 5-methylisophthelic acid], through solvothermal synthesis by using a mixed-ligand strategy. Structural analysis reveals that these isomorphic compounds display a 3,5-connected two-dimensional network with an unprecedented (4(2)center dot 6(7)center dot 8)(4(2)center dot 6) topology. Both of them exhibit certain chemical stability and thermal stability. Notably, the photocatalytic properties of the two compounds for the degradation of several organic dyes have been explored.