Poly[[nonaaquabis(μ-5-hydroxybenzene1,3-dicarboxylato)(5-hydroxybenzene1,3-ndicarboxylato) dicerium(III)] hexahydrate]

In the title coordination polymer, {[Ce-2(C8H4O5)(3)(H2O)(9)]center dot 6H(2)O}(n), the asymmetric unit is formed by two Ce III atoms, three 5-hydroxybenzene-1,3-dicarboxylate ligands, nine coordinating water molecules and six water molecules of crystallization. The two Ce III atoms are bridged by 5-hydroxybenzene- 1,3-dicarboxylate ligands acting in a bis-bidentate coordination mode, generating infinite chains along [101]. Both independent metal atoms are nine-coordinated, one by four O atoms from the carboxylate groups of two bridging 5hydroxybenzene- 1,3-dicarboxylate ligands and five O atoms from water molecules, generating a tricapped trigonalprismatic geometry. The coordination around the second Ce III atom is similar, except that one of the water molecules is replaced by an O atom from an additional 5-hydroxybenzene1,3-dicarboxylate ligand acting in a monodentate coordination mode and forming a capped square-antiprismatic geometry.