catena-Poly[[bis(μ3-5-hydroxyisophthalato)bis(pyrazino[2,3-f][1,10]phenanthroline)dicadmium] dihydrate]

The title coordination polymer, {[Cd2(C8H4O5)2(C14H8N4)2]·2H2O}n, has a layered structure. The asymmetric unit contains two CdII ions, two pyrazino[2,3-f][1,10]phenanthroline, two 5-hydroxyisophthalate (hip) ligands and two lattice water molecules. Each CdII ion is coordinated by two N atoms from a chelating pyrazino[2,3-f][1,10]phenanthroline and four O atoms from three different hip ligands, resulting in a distorted CdN2O4 octahedral coordination environment. The hip ligand connects adjacent CdII ions, forming forming layers parallel to (010). Intralayer O—H...O hydrogen bonds involving the hydroxy groups and solvent water molecules consolidate the crystal packing