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The title lanthanide complex, [Er 2 (C 6 H 2 O 4 ) 3 (H 2 O) 6 ]·18H 2 O, is isostructural with its La, Gd, Yb and Lu analogues. The Er 3+ ion, located on a threefold rotation axis, is nine-coordinated in a distorted tricapped trigonal-prismatic geometry, which is completed by six oxygen atoms from three dhbq 2- ligands and three oxygen atoms from coordinated water mol-ecules. Each dhbq 2- ligand acts in a μ 2 -bis-(bidentate) bridging mode to connect two Er 3+ ions to form honeycomb (6,3) two-dimensional sheets extending in the ab plane, having an Er⋯Er separation of 8.7261 (2) Å. In the crystal, extensive O-H⋯O hydrogen-bonding inter-actions involving the coordinated water mol-ecules and the water mol-ecules of crystallization, as well as the oxygen atoms of the dhbq 2- ligands, generate an overall three-dimensional supra-molecular network.

Crystal structure of poly[[hexaaquatris(μ-3,6-dioxocyclohexa-1,4-diene-1,4-diolato)dierbium(III)] octadecahydrate]