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The title compound, [Cu3(C7H3NO4)4(C2H8N2)2]·C2H8N2·4H2O, was obtained by the reaction of copper(II) acetate dihydrate with pyridine-2,6-dicarb­oxy­lic acid (H2dipic) and ethyl­enediamine (en) in an aqueous solution. All of the CuII atoms in the trinuclear centrosymmetric title complex are six-coordinated in a distorted octa­hedral geometry with N2O4 and N4O2 environments for the outer and central CuII atoms, respectively. Various inter­actions, including numerous O—H...O and C—H...O hydrogen bonds and C—O...π stacking of the pyridine and carboxyl­ate groups [O...centroid distances = 3.669 (2) and 3.668 (2) Å] are observed in the crystal structure.

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The asymmetric unit of the title complex, (C6H8N)2[Cu(C7H3NO4)2]·6H2O, contains half a copper(II)–dipicolinate complex located on a twofold rotation axis, one protonated aniline mol­ecule and three solvent water mol­ecules. The CuII atom is coordinated by four O atoms and two N atoms from two dipicolinate ligands in a distorted octa­hedral environment. In the crystal, the components are linked into a three-dimensional framework by inter­molecular O—H...O and N—H...O inter­actions.
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