Diaqua­bis­(2-hy­droxy­benzoato-κO (1))bis­(nicotinamide-κN (1))cadmium–diaqua­bis­(2-hy­droxy­benzoato-κ(2) O (1),O (1′))(nico­tin­amide-κN)cadmium–water (1/2/4)

The crystal structure of the title compound, [Cd(C(7)H(5)O(3))(2)(C(6)H(6)NO)(2)(H(2)O)(2)]·2[Cd(C(7)H(5)O(3))(2)(C(6)H(6)NO)(H(2)O)(2)]·4H(2)O, consists of two kinds of Cd(II) complexes (A and B) and lattice water mol­ecules. In complex A, [Cd(C(7)H(5)O(3))(2)(C(6)H(6)NO)(2)(H(2)O)(2)], the Cd(II) cation is located on an inversion center and is coordinated by two salicylate anions, two nicotinamide (NA) ligands and two water mol­ecules in a slightly distorted octa­hedral geometry. In complex B, [Cd(C(7)H(5)O(3))(2)(C(6)H(6)NO)(H(2)O)(2)], the Cd(II) cation is coordinated by two salicylate anions, one nicotinamide (NA) ligand and two water mol­ecules in an irregular seven-coordinate geometry. There are extensive intra­molecular O—H⋯O and weak C—H⋯O hydrogen bonds as well as extensive inter­molecular O—H⋯O and N—H⋯O hydrogen bonding in the crystal structure. π–π stacking between the pyridine and benzene rings, between the benzene rings, between the benzene and pyridine rings and between the pyridine rings [centroid–centroid distances = 3.5989 (10), 3.6005 (10), 3.5800 (9) and 3.5205 (10) Å, respectively] further stabilize the crystal structure. A weak N—H⋯π inter­action also occurs. One of the lattice water mol­ecules is disordered over two positions with an occupancy ratio of 0.70:0.30.