Crystal structure of a cadmium sulfate coordination polymer based on the 3,6-bis­­(pyrimidin-2-yl)-1,4-di­hydro-1,2,4,5-tetra­zine ligand

The polymeric title compound, poly[aqua­hemi[μ2-3,6-bis­(pyrimidin-2-yl)-1,4-di­hydro-1,2,4,5-tetra­zine](μ3-sulfato)­cadmium(II)], [Cd(SO4)(C10H8N8)0.5(H2O)]n, (I), represents an example of a three-dimensional coordination polymer resulting from the reaction of CdSO4·8/3H2O with 3,6-bis­(pyrimidin-2-yl)-1,4-di­hydro-1,2,4,5-tetra­zine (H2bmtz, C10H8N8) under hydro­thermal conditions. The CdII atom has a distorted octa­hedral coordination environment defined by two nitro­gen atoms from one H2bmtz ligand, three oxygen atoms from three different sulfate anions, and one oxygen atom from a coordinating water mol­ecule. The 1,4-di­hydro-1,2,4,5-tetra­zine ring of the H2bmtz ligand is located about an inversion center, with the NH group being equally disordered over two sites. The sulfate anion acts as a μ3-bridging ligand to connect three CdII atoms, resulting in the formation of [Cd(SO4)(H2O)] sheets propagating parallel to the bc plane. Adjacent sheets are inter­connected across the H2bmtz ligands, which coordinate the CdII atoms in a bis-bidentate coordination mode, to form a three-dimensional framework structure. The framework is further stabilized by classical O—H⋯O hydrogen bonds involving the coordinating water mol­ecules and the sulfate groups, and by N—H⋯O hydrogen bonds between the disordered tetra­zine NH groups and sulfate oxygen atom, along with C—H⋯π and π–π stacking [centroid-to-centroid separation = 3.5954 (15) Å] inter­actions between parallel pyrimidine rings of the H2bmtz ligand.