Poly[tetraaquabis(μ4-thiophene-2,5-dicarboxylato)(μ2-thiophene-2,5-dicarboxylato)dieuropium(III)]

The three-dimensional coordination polymer, [Eu2(C6H2O4S)3(H2O)4]n, has been synthesized under hydrothermal conditions. The asymmetric unit comprises one Eu3+cation, two aqua ligands and one and a half thiophene-2,5-dicarboxylate anions (the half-anion being completed by a twofold rotation axis). The Eu3+cation is eight-coordinated in a distorted dodecahedral geometry. The crystal structure features O—H...O hydrogen bonds.