Bis(8-hy-droxy-2-methyl-quinolinium) bis-(pyridine-2,6-dicarboxyl-ato)-nickelate(II) methanol monosolvate monohydrate.

In the title compound, (C(10)H(10)NO)(2)[Ni(C(7)H(3)NO(4))(2)]·CH(3)OH·H(2)O, the coordination geometry of the Ni(II) atom can be described as distorted octa-hedral. In the crystal, noncovalent inter-actions play an important role in the stabilization of the structure, involving O-H⋯O, N-H⋯O and weak C-H⋯O hydrogen bonds and π-π stacking inter-actions between the pyridine rings of the pyridine-2,6-dicarboxyl-ate ligands [centroid-centroid distance = 3.7138†(15)†à ] and between the 8-hy-droxy-2-methyl-quinolinium cations [centroid-centroid distances = 3.6737†(15), 3.4434†(14), 3.6743†(15), 3.7541†(16), 3.5020†(15) and 3.7947†(15)†à ].