Bis[-2-{bis(2-pyridylethyl)amino}phenolato]bis[aquanickel(II)] dinitrate tetrahydrate

The title complex, [Ni2(L–O−)(H2O)2](NO3)2·4H2O, where L–O− is bis{2-[bis(2-pyridyl)­ethyl]­amino}phenol (C20H20N3O), is dimeric with each Ni2+ ion coordinated by two bridging phenolate O atoms and three N atoms of the N3O-tetradentate ligand anion L–O−. A mol­ecule of water on each metal completes the octahedral geometry. Crystallographic inversion symmetry is present at the center of the Ni2O2 plane of the dimeric unit.

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