Acta Cryst. (2013). E69, m452-m453 [ doi:10.1107/S1600536813018722 ]
Abstract: The structure of the title polymer, }[Mg(C6H14N2O6P2)(H2O)4]·0.5H2O}n, is based on centrosymmetric MgO6 octahedra, which are linked by [(piperazine-1,4-diium-1,4-diyl)bis(methylene)]diphosphonate ligands, forming chains parallel to [1-1-1]. These chains are connected via hydrogen bonds primarily formed between the phosphonate groups and water molecules. The latter constitute four of the corners of the MgO6 polyhedra and bind to the O atoms of the phosphonate groups of neighbouring chains. The lattice water molecule is disordered around an inversion centre, exhibiting an occupancy of 0.25.
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