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In the title compound, [Ni(C 5 H 6 O 4 ) 2 (C 10 H 10 N 3 ) 2 ]·6H 2 O, divalent nickel ions situated on the crystallographic twofold axis are octa­hedrally coordinated by four O atoms from two dimethyl­malonate ligands in a 1,3-chelating mode and two N atoms from two protonated monodentate 4,4′-dipyridylamine mol­ecules. The mol­ecules link into chains  via  N—H⋯O hydrogen bonding mediated by protonated pyridyl groups. The chains form layer patterns  via  π–π stacking [centroid–centroid distance = 3.777 (2) Å] . Water mol­ecule hexa­mers are generated from the unligated water mol­ecules (three per asymmetric unit) by inversion centers at Wyckoff position  d . These clusters are situated between the pseudolayers, providing hydrogen-bonding pathways that build up the three-dimensional structure.

Bis(dimethylmalonato-κ2O,O′)bis[4-(4-pyridylamino-κN4)pyridinium]nickel(II) hexahydrate

Bis(dimethylmalonato-κ²O,O′)bis[4-(4-pyridylamino-κN⁴)pyridinium]nickel(II) hexahydrate