catena-Poly[[tetra-aqua-[trans-1,2-bis-(4-pyrid-yl)ethene-κN:N']nickel(II)] dinitrate].

In the title compound, {Ni(C(12)H(10)N(2))(H(2)O)(4)(2)}(n), the Ni(II) ion, lying on a crystallographic inversion center, has a distorted octa-hedral coordination sphere comprising four water ligands and two N-atom donors from the trans-related 1,2-bis-(4-pyrid-yl)ethene ligands, which also have crystallographic inversion symmetry. These ligands bridge the Ni(II) complex units, forming chains extending along the [110] and [[Formula: see text]10] directions. The nitrate counter-anions stabilize the crystal structure through water-nitrate O-H⋯O hydrogen bonds.