Bis{μ-N-[(E)-4-benz­yloxy-2-oxidobenzyl­idene]-4-nitro­benzene­carbo­hydrazidato}bis­[di­aqua­nickel(II)] di­methyl­formamide tetra­solvate

The molecule of the title complex, [Ni(2)(C(21)H(15)N(3)O(5))(2)(H(2)O)(4)]·4C(3)H(7)NO, is located on an inversion centre. This results in a dimeric Ni(II) complex, with the two Ni(II) atoms bridged by phenolate O atoms. The tridentate ligand is chelated to each Ni(II) atom via one N and two O atoms of the imino­late form of the hydrazide moiety, which has the same conformation as the free ligand. The coordination geometry around each Ni(II) ion is slightly distorted octa­hedral. A supra­molecular three-dimensional architecture is created by dominant inter­molecular O—H⋯N, O—H⋯O and C—H⋯O hydrogen-bonding inter­actions. These are augmented by two C—H⋯π inter­actions and a π–π inter­action with a centroid–centroid distance of 3.681 (2) Å.