(3,3′-{(1E,1′E)-1,1′-[Ethane-1,2-diylbis(azan-1-yl-1-yl­idene-κN)]bis­(ethan-1-yl-1-yl­idene)}di­pyrazine 1-oxide-κN (4))bis­(nitrato-κO)nickel(II) monohydrate

In the title complex, [Ni(NO(3))(2)(C(14)H(16)N(6)O(2))]·H(2)O, the Ni(II) atom, lying on a twofold rotation axis, is coordinated by a tetra­dentate 3,3′-{(1E,1′E)-1,1′-[ethane-1,2-diylbis(azan-1-yl-1-yl­idene)]bis­(ethan-1-yl-1-yl­idene)}di­pyrazine 1-oxide ligand and two mutually trans monodentate nitrate anions in a distorted o­cta­hedral geometry. The lattice water mol­ecule is located on a twofold rotation axis. The complex mol­ecules are linked by the water mol­ecules through O—H⋯O hydrogen bonds into a chain along [001]. Further C—H⋯O hydrogen bonds lead to the formation of a three-dimensional network.