Diaqua-bis[4-(dimethyl-amino)benzoato-O](nicotinamide-N ¹)manganese(II) dihydrate

The title manganese complex, [Mn(C9H10NO2)2(C6H6N2O)2(H2O)2]·2H2O, is monomeric and centrosymmetric. It contains two 4-(dimethyl-amino)benzoate (DMAB) and two nicotin-amide (NA) ligands, two coordinated and two uncoordinated water mol-ecules, all ligands being monodentate. The four O atoms in the equatorial plane around the Mn atom form a slightly distorted square-planar arrangement, while the distorted octa-hedral coordination is completed by the two NA N atoms in the axial positions. In the crystal structure, inter-molecular O - H⋯O and N - H⋯O hydrogen bonds link the mol-ecules to form a supra-molecular structure.