Poly[[μ-(1-ammonio­ethane-1,1-di­yl)bis­(hydrogenphospho­nato)]diaquachloridodisodium]: a powder X-ray diffraction study

The title compound, [Na₂(C₂H₈NO₆P₂)Cl(H₂O)₂]_n, has a polymeric two-dimensional structure extending parallel to (001). The asymmetric unit contains two Na⁺ cations located on a centre of symmetry and on a mirror plane, respectively, one half of a bis-phospho­nate anion (the entire anion is completed by mirror symmetry), one chloride anion on a mirror plane and one water mol­ecule in general positions. The two Na⁺ cations exhibit distorted octa­hedral NaCl₂O₄ coordination polyhedra, each consisting of two deprotonated O atoms of the bis-phospho­nate anion, of two water mol­ecules and of two chloride anions. Strong O—H...O hydrogen bonds between the –OH group and one of the free O atoms of the bis-phospho­nate anion connect adjacent layers along [100], supported by N—H...Cl inter­actions. Intra­layer O—H...O and N—H...O hydrogen bonds are also observed.