A fourfold inter­penetrating diamondoid three-dimensional coordination polymer: poly[[[[mu]₂-1,2-bis­(pyridin-4-yl)ethene-[kappa]²N:N']([mu]₂-5-hy­droxy­isophthalato-[kappa]²O¹:O³)zinc(II)] 1,2-bis­(pyridin-4-yl)ethene hemisolvate]

In the title compound, {[Zn(C₈H₄O₅)(C₁₂H₁₀N₂)]·0.5C₁₂H₁₀N₂}_n or {[Zn(HO-BDC)(bpe)]·0.5bpe}_n [HO-H₂BDC is 5-hy­­droxy­isophthalic acid and bpe is 1,2-bis­(pyridin-4-yl)eth­ene], the asymmetric unit contains a Zn^II atom, one HO-BDC ligand, one coordinated bpe ligand and half a noncoordinating bpe mol­ecule with crystallographic inversion symmetry. Each Zn^II centre is four-coordinated by two O atoms from two distinct HO-BDC ligands and two N atoms from two different bpe ligands in a ZnO₂N₂ coordination environment. The three-dimensional topology of the title compound corresponds to a fourfold inter­penetrating diamondoid coordination polymer network, with the uncoordinated bpe ligands located in the cavities, hydrogen bonded to the main network via the hy­droxy group of the HO-H₂BDC ligand.