Diaquabis[4-(dimethylamino)benzoato-κO]bis(nicotinamide-κN ¹)zinc(II)dihydrate

In the centrosymmetric title structure, [Zn(C₉H ₁₀NO₂)₂(C₆H₆N ₂O)₂(H₂O)₂]·2H₂O, the Zn^II cation, located on an inversion center, is coordinated by two 4-(methyl-amino)-benzoate anions, two nicotinamide ligands and two water molecules in a slightly distorted octa-hedral geometry. The dihedral angle between the carboxyl-ate group and the attached benzene ring is 3.09 (9)°, while the pyridine and benzene rings are oriented at a dihedral angle of 77.10 (4)°. The uncoordinated water molecule is linked to nicotinamide ligands by O - H⋯O hydrogen bonds. In the crystal, inter-molecular N - H⋯O, O - H⋯O and C - H⋯O hydrogen bonds link the molecules into a three-dimensional network. A weak N - H⋯π inter-action also occurs.