An unusual two-dimensional MOF formed from Ni II , thiophene-2,5-dicarboxylate and trans -1,2-bis(pyridin-4-yl)ethylene

A new Ni II MOF, poly[[sesqui[μ- trans -1,2-bis(pyridin-4-yl)ethylene](μ-thiophene-2,5-dicarboxylato)nickel(II)] dimethylformamide 0.205-solvate], {[Ni(C 6 H 3 O 4 S)(C 12 H 10 N 2 ) 1.5 ].0.205C 3 H 7 NO} n , was obtained under solvothermal conditions and its structure was determined by single-crystal X-ray diffraction. The structure reveals that Ni nodes are bridged by thiophene-2,5-dicarboxylate (HT) and trans -1,2-bis(pyridin-4-yl)ethylene (Bpe) to generate an unusual two-dimensional layered framework, and the overall crystal is formed by an interlocked stacking of these layers. Topological simplification classifies the framework as a non-interpenetrated 3-nodal (2,2,5)-connected net, in which the Ni-containing node acts as the higher-connected vertex and the two organic ligands serve as 2-connected linkers propagating the connectivity within the layer. The experimental powder X-ray diffraction (PXRD) pattern is in good agreement with that simulated from the single-crystal structure, further confirming that the powder sample is consistent with the single-crystal model and exhibits good phase purity.