Poly[[[mu]-(1-aza­nium­yl­ethane-1,1-di­yl)bis­(hydrogen phosphon­ato)]sodium]: a powder X-ray diffraction study

The central Na⁺ cation exhibits distorted octa­hedral coordination geometry involving two deprotonated O atoms, two hy­droxy O atoms and two double-bonded O atoms of the bis­phosphon­ate anion. Pairs of sodium-centred octa­hedra share edges and the pairs are in turn connected to each other by the biphosphon­ate anion to form a two-dimensional network parallel to the (001) plane.