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In the title complex, [Ni(NO3)2(C14H16N6O2)]·H2O, the Ni(II) atom, lying on a twofold rotation axis, is coordinated by a tetra-dentate 3,3'-{(1E,1'E)-1,1'-[ethane-1,2-diylbis(azan-1-yl-1-yl-idene)]bis-(ethan-1-yl-1-yl-idene)}di-pyrazine 1-oxide ligand and two mutually trans monodentate nitrate anions in a distorted o-cta-hedral geometry. The lattice water mol-ecule is located on a twofold rotation axis. The complex mol-ecules are linked by the water mol-ecules 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.

acta crystallographica. section e

(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-κN4)bis(nitrato-κO)nickel(II) monohydrate