An unusual two-dimensional MOF formed from Ni^II, thio-phene-2,5-di-carboxyl-ate and...

A new Ni^II MOF, poly[[sesqui[μ-trans-1,2-bis-(pyridin-4-yl)ethyl-ene](μ-thio-phene-2,5-di-carboxyl-ato)nickel(II)] di-methyl-formamide 0.205-solvate], {[Ni(C₆H₃O₄S)(C₁₂H₁₀N₂)_1.5].0.205C₃H₇NO} _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 thio-phene-2,5-di-carboxyl-ate (HT) and trans-1,2-bis-(pyridin-4-yl)ethyl-ene (Bpe) to generate an unusual two-dimensional layered framework, and the overall crystal is formed by an inter-locked stacking of these layers. Topological simplification classifies the framework as a non-inter-penetrated 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.