Tetra­aqua­tetra­manganese(II) catena-[germanodihydroxidodi(hydrogen­phosphate)diphosphate]

The title compound, Mn(4)(H(2)O)(4)[Ge(OH)(2)(HPO(4))(2)(PO(4))(2)], was synthesized by the solvothermal method. Its crystal structure is isotypic with the iron and cobalt analogues [Huang et al. (2012 ▶). Inorg. Chem. 51, 3316–3323]. In the crystal structure, the framework is built from undulating manganese phosphate sheets parallel to (010) inter­connected by GeO(6) octa­hedra (at the inversion center), resulting in a three-dimensional network with eight-membered ring channels into which all the protons point. The undulating manganese phosphate sheet consists of zigzag manganese octa­hedral chains along [10-1], built from MnO(4)(OH)(OH(2)) octa­hedra and MnO(5)(OH(2)) octa­hedra by sharing their trans or skew edges, which are inter­connected by PO(3)(OH) and PO(4) tetra­hedra via corner-sharing. The crystal structure features extensive O—H⋯O hydrogen-bonding inter­actions.