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In the title compound, [Ni2(C7H5O2)(C27H27N4O2)(H2O)]·2.38H2O, each Ni atom is coordinated by two N atoms and four O atoms from the hepta­dentate Schiff base ligand and one salicylaldehyde or water mol­ecule, forming an asymmetric mol­ecule with three bridges linking the two NiII ions, which are separated by 3.081 (1) Å. Hydrogen-bonded water and C—H...π inter­actions take part in the stabilization of the complex. The complex molecules are connected into a one-dimensional chain along the c axis by O—H...O hydrogen bonds between coordinated and solvent water mol­ecules and by C—H...π inter­actions.

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The self-assembly of the title dinuclear complex, namely (μ-p-phenyl­enediamine-N,N,N′,N′-tetra­acetato)bis­[aqua­(1,10-phenanthroline)nickel(II)] dodecahydrate, [Ni2(C14H12N2O8)(C12H8N2)2(H2O)2]·12H2O, through intricate noncovalent inter­actions results in a two-dimensional sheet-like structure. The dimer lies about an inversion centre at the centre of the p-phenylenediamine ring. Uncoordinated water mol­ecules form one-dimensional chains in which cyclic water tetra­mers act as two types of building blocks. The water mol­ecules play a significant role in the stabilization of the three-dimensional supra­molecular framework. Intra­molecular `aryl–metal chelate ring' π–π inter­actions are also observed.
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