(μ-2,2′-Bipyrimidine-κ(4) N (1),N (1′):N (3),N (3′))bis­[triaqua­(sulfato-κO)manganese(II)]

The title complex, [Mn(2)(SO(4))(2)(C(8)H(6)N(4))(H(2)O)(6)], is the second monoclinic polymorph [De Munno et al. (1995 ▶). Inorg. Chem. 34, 408–411; Hong et al. (1996 ▶). Polyhedron, 15, 447–452]. The asymmetric unit contains two crystallographically independent half-mol­ecules of the binuclear Mn(II) complex; an inversion centre is located at the centroid of each complex. The two Mn(II) atoms in each complex mol­ecules are bridged by a bis-chelating 2,2′-bipyrimidine (bpym) ligand and each Mn(II) atom is six-coordinated in a considerably distorted octa­hedral environment defined by two N atoms of the bridging bpym ligand and four O atoms from one sulfato anionic ligand and three water mol­ecules. In the crystal, the complex mol­ecules are linked by O—H⋯O hydrogen bonds between the water and sulfato ligands, forming a three-dimensional network.