Diaquabis[5-(pyrimidin-2-yl-κN)tetrazolato-κN1]copper(II)

In the title complex, [Ni(C5H3N6)2(H2O)2], the NiII atom is located in a general position and is coordinated by four N atoms from two 5-(pyrimidin-2-yl)tetra­zolate ligands and O atoms of two water mol­ecules in a distorted octa­hedral geometry. The bond distances and angles around the metal center lie in the ranges 2.051 (5)–2.097 (5) A and 78.88 (19)–101.22 (19)°, respectively. The title complex is isostructural with its MnII and CuII analogues; it is, however, structurally different from an NiII complex obtained by direct reaction of 2-(1H-tetra­zol-5-yl)pyrimidine with an NiII salt under hydro­thermal conditions. In the crystal structure, mol­ecules are linked together by O—H⋯N hydrogen bonds, forming a two-dimensional network parallel to the (001) plane.