Poly[[bis­[penta­aqua­gadolinium(III)]-μ4-benzene-1,2,3,4,5,6-hexa­carboxyl­ato] tetra­hydrate]

The title compound, {[Gd2(C12O12)(H2O)10]·4H2O}n, consists of an extended network of Gd ions coordinated by the mellitate anions and water mol­ecules. In this complex, each Gd atom involves a dodeca­hedral coordination environment comprising five water mol­ecules and three O atoms from two separate mellitate anions. The center of mass of the hexa­anion [C6(COO)6]6− coincides with a crystallographic inversion center.