A new aqua­manganese(II) oxalate phosphate, Mn(C(2)O(4))Mn(3)(PO(4))(2)(H(2)O)(2)

The title salt, diaquatetra­manganese(II) oxalate bis[ortho­phos­phate(V)], Mn(4)(C(2)O(4))(PO(4))(2)(H(2)O)(2), was synthesized hydro­thermally and displays a three-dimensional framework structure. The asymmetric unit consists of two different Mn(II) centers, half of an oxalate anion, a phosphate group and a coordinated water mol­ecule. A crystallographic inversion center is located at the mid-point of the oxalate C—C bond. The distorted octa­hedral MnO(6) and the tetra­gonal pyramidal MnO(5) centers are linked through bridging oxalate and phosphate groups. The water mol­ecule also has a weaker bonding contact to the five-coordinate Mn atom, which consequently exhibits a distorted octa­hedral geometry and also bridges the independent Mn atoms. The water mol­ecule is a donor for intra- and inter­molecular O—H⋯O hydrogen bonds.