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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.

A new aquamanganese(II) oxalate phosphate, Mn(C2O4)Mn3(PO4)2(H2O)2

A new aquamanganese(II) oxalate phosphate, Mn(C₂O₄)Mn₃(PO₄)₂(H₂O)₂