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

Abstract

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.