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Acta Cryst. (2008). E64, m1603  [ doi:10.1107/S160053680803835X ]

Bis(dimethylmalonato-[kappa]2O,O')bis[4-(4-pyridylamino-[kappa]N4)pyridinium]nickel(II) hexahydrate

G. A. Farnum and R. L. LaDuca

Abstract: In the title compound, [Ni(C5H6O4)2(C10H10N3)2]·6H2O, 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 [pi]-[pi] 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.

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