Poly[[tetra­chlorido{μ₄-tetra­kis[(pyridin-4-yl)oxymeth­yl]methane-κ⁴N:N′:N′′:N′′′}dizinc(II)] di­methyl­formamide tetrasolvate]

A novel metal–organic framework, {[Zn₂Cl₄(C₂₅H₂₄N₄O₄)]·4C₃H₇NO}_n, has been synthesized solvothermally by assembling the semi-rigid tetra­hedral ligand tetra­kis­[(pyridin-4-yl)oxymeth­yl]methane (tpom) and zinc nitrate in di­methyl­formamide (DMF). The crystal structure is noncentrosymmetric (P2₁c). Each Zn^II cation has a tetra­hedral co­ordination environment (C₂ symmetry), which is formed by two chloride ligands and two pyridine N atoms from two tpom ligands. The tetra­hedral tetra­dentate tpom linker has a quaternary C atom located on the crystallographic axis. This linker utilizes all the peripheral pyridine N atoms to connect four Zn^II cations, thereby forming a wave-like two-dimensional sheet along the c axis. The two-dimensional layer can be topologically simplified as a typical uninodal 4-connected sql/Shubnikov net, which is represented by the Schläfli symbol {4⁴,6²}. Adjacent layers are further packed into a three-dimensional structure by C—H...Cl hydrogen bonds.