Poly[[[triaqua­erbium(III)]-μ₃-succinato] chloride dihydrate]

The title compound, {[Er(C₄H₄O₄)(H₂O)₃]Cl·2H₂O}_n, crystallizes with an infinite polymeric structure, in which erbium(III) ions on twofold rotation axes are bridged by centrosymmetric succinate dianions. The carboxyl­ate groups of the dicarboxyl­ate coordinate in a tridentate-bridging manner to the otherwise water-coordinated Er^III ion. The structure is completed by Cl⁻ anions and uncoordinated water molecules.