catena-Poly­[di­aqua­zinc(II)-μ-(diethyl di­chloro­methyl­enebis­phospho­nato)-κ³O,O′:O′′-tetra­aqua­zinc(II)-μ-(diethyl di­chloro­methyl­enebis­phosphonato)-κ³O:O′,O′′]

The title structure, [Zn(C₅H₁₀Cl₂O₆P₂)(H₂O)₃]_n, consists of one-dimensional chains. The structure is best described as centrosymmetric monomeric units consisting of octahedral Zn atoms with two symmetrically chelating [Cl₂C(PO₃Et)₂]²⁻ ligands, connected into polymeric chains along the [110] direction by further octahedral Zn atoms.

catena-Poly­[di­aqua­cadmium(II)-μ-(diethyl di­chloro­methyl­enebis­phospho­nato)-κ³O,O′:O′′-tetra­aqua­cadmium(II)-μ-(diethyl di­chloro­methyl­enebis­phospho­nato)-κ³O:O′,O′′]

The title compound, [Cd(C₅H₁₀Cl₂O₆P₂)(H₂O)₃]_n, is isomorphous with the Zn and Mg complexes of the (Cl₂CP₂O₆Et₂)²⁻ ligand. The structure can be described as centrosymmetric octahedral Cd atoms with two symmetrically chelating [Cl₂C(PO₃Et)₂]²⁻ ligands, connected into polymeric chains along the [110] direction by further octahedral Cd atoms.