Heptaaqua-(3,4,5,6-tetra-chloro-phthalato-κO(1))erbium(III) 2-carb-oxy-3,4,5,6-tetra-chloro-benzoate-3,4,5,6-tetra-chloro-phthalic acid-water (1/1/1)

In the three-dimensional tetra-chloro-phthalate-bridged title complex [Er(C(8)Cl(4)O(4))(H(2)O)(7)](C(8)HCl(4)O(4))·C(8)H(2)Cl(4)O(4)·H(2)O, the Er(III) ion is coordinated in form of a distorted square antiprism by an O atom of a tetra-chloro-phthalate ligand and by seven water O atoms. Extensive hydrogen bonds establish a layered network structure extending parallel to (001).