(2,4-Dioxo-1,2,3,4-tetra­hydro­pyrimi­dine-5-carboxyl­ato-κ(2) O (4),O (5))(4-oxido-2-oxo-1,2-dihydro­pyrimidine-5-carboxyl­ato-κ(2) O (4),O (5))bis­(1,10-phenanthroline-κ(2) N,N′)yttrium(III) dihydrate

In the title compound, [Y(C(5)H(2)N(2)O(4))(C(5)H(3)N(2)O(4))(C(12)H(8)N(2))(2)]·2H(2)O, the Y(III) ion lies on a twofold rotation axis and exhibits a distorted square-anti­prismatic coordination geometry. It is chelated by two 1,10-phenanthroline ligands, a 2,4-dioxo-1,2,3,4-tetra­hydro­pyrimidine-5-carboxyl­ate mono­anion and a 4-oxido-2-oxo-1,2-dihydro­pyrimidine-5-carboxyl­ate dianion. The H atom involved in an N—H⋯N hydrogen bond between the 1,2-dihydro­pyrimidine units has half occupancy and is disordered around a twofold rotation axis.