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In the title complex, {[Ni2(C14H4N2O8)(H2O)6]·2H2O}n, the two NiII atoms are located in different special positions (one on a twofold rotation axis and the second on a centre of symmetry) and have different distorted octa­hedral environments (one by two N atoms from a bipyridine unit, two O atoms from two water mol­ecules and two O atoms from two carboxyl­ate groups, and the second by four O atoms from four water mol­ecules and two O atoms from two carboxyl­ate groups). Thus, the environments of the NiII atoms may be denoted as NiN2O4 and NiO6. In the crystal, there exists an extensive network of classical O—H...O hydrogen bonds.
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