Poly[dimethylammonium aquadi-μ-oxalatoeuropate(III) trihydrate]

In the crystal structure of the polymeric title compound, (C 2H8N)[Eu(C2O4)2(H 2O)]·3H2O, the independent oxalate that lies on a general position chelates to two Eu atoms, as do the other two oxalates that lie on different centres of inversion, the bridging mode of the oxalates giving rise to a three-dimensional anionic network. The water-coordinated Eu atom exists in a tricapped trigonal-prismatic geometry. The cations and solvent water molecules occupy the cavities of the network and are involved in hydrogen bonding with each other and with the network.