Poly[dimethyl­ammonium [aquadi-μ(2)-oxalato-dysprosate(III)] trihydrate]

The title compound, {(C(2)H(8)N)[Dy(C(2)O(4))(2)(H(2)O)]·3H(2)O}(n), was obtained as an unexpected product under hydro­thermal conditions. The Dy(III) atom is chelated by four oxalate anions, two of which are situated on two different centres of inversion. The distorted tricapped trigonal-prismatic coordination sphere of the Dy(III) atom is completed by a water mol­ecule. The bridging mode of the anions results in the formation of a three-dimensional network with cavities where the ammonium cations and the uncoordinated water mol­ecules reside. The structure is stabilized by numerous N—H⋯O and O—H⋯O hydrogen-bonding inter­actions.