Tetra-aqua-bis[4-(methyl-amino)benzoato-κO]nickel(II).

The title complex, [Ni(C(8)H(8)NO(2))(2)(H(2)O)(4)], is centrosymmetric with the Ni(II) ion located on a centre of symmetry. It contains two 4-(methyl-amino)benzoate (PMAB) anions and four coordinated water mol-ecules. The four O atoms in the equatorial plane around the Ni(II) ion form a slightly distorted square-planar arrangement, while the slightly distorted octa-hedral coordination is completed by two O atoms of the PMAB anions in the axial positions. In the crystal structure, inter-molecular O-H⋯O, O-H⋯N, N-H⋯O and C-H⋯O hydrogen bonds link the mol-ecules into a three-dimensional network.