(2,4-Dioxo-1,2,3,4-tetra-hydro-pyrimi-dine-5-carboxyl-ato-κO,O)(4-oxido-2-oxo-1,2-dihydro-pyrimidine-5-carboxyl-ato-κO,O)bis-(1,10-phenanthroline-κN,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-anti-prismatic coordination geometry. It is chelated by two 1,10-phenanthroline ligands, a 2,4-dioxo-1,2,3,4-tetra-hydro-pyrimidine-5-carboxyl-ate mono-anion and a 4-oxido-2-oxo-1,2-dihydro-pyrimidine-5-carboxyl-ate dianion. The H atom involved in an N-H⋯N hydrogen bond between the 1,2-dihydro-pyrimidine units has half occupancy and is disordered around a twofold rotation axis.