Structures, Photoluminescence, and Photocatalytic Properties of Six New Metal-Organic Frameworks Based on Aromatic Polycarboxylate Acids and Rigid Imidazole-Based Synthons

Six metal-organic coordination polymers, [Cu(bdc)(bimb)](n) (H(2)bdc = 1,4-benzenedicarboxylate; bimb = 4,4'-bis(1-imidazolyl)biphenyl) (1), [Cu-3(btc(2)(bimb)(2)center dot(H2O)(3)](n) (H(3)btc = 1,3.5-benzenetricarboxylate) (2), [M-3(btc)(2)(bimb)(2)center dot(H2O)(4)](n) (M = Mn for 3, Co for 4, Cd for 5), and [Cd(btcH)(bimb)](n) (6) were obtained under hydrolthermal conditions and characterized structurally. The networks exhibit it variety of topologies: compound 1 exhibits it triply interpenetrating three-dimensional (3D) framework with a distorted primitive cubic (alpha-Po) single net; compounds 2-5 are isomorphic, which possess a trinodal 4-connected 3D framework: Compound 6 has a two-dimensional (3,4)-connected framework. In addition, the thermal stabilities for 1-6 and the photoluminescence properties for 5 and 6 were examined. An anionic organic dye X3B was selected its a model pollutant in aqueous Media to evaluate the photocatalytic effectiveness of isostructural compounds 3 and 4, and the results indicated compounds 3 and 4 represent rare examples of coordination polymers that exhibit high photocatalytic activity for dye degradation under UV light and show good stability toward photocatalysis. The difference in catalytic activity between 3 and 4 arises front the discrepancy in central metal ions of the two compounds.