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The title compound, [Gd(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, was obtained from a solvothermal reaction of 2,4-dihydroxy-pyrimidine-5-carboxylic acid (H(3)iso), GdCl(3)·6H(2)O and 1,10-phenanthroline (phen). The Gd(III) ion is located on a twofold rotation axis and is coordinated by four N atoms from two chelating phen ligands and four O atoms (5-carboxyl-ate and 4-oxido O atoms) from H(2)iso(-) and Hiso(2-) ligands. The mol-ecules are linked into a three-dimensional network by N-H⋯O, N-H⋯N and O-H⋯O hydrogen bonds. The H atom involved in an N-H⋯N hydrogen bond is disordered around a twofold rotation axis with half occupancy.

acta crystallographica. section e

(4-Oxido-2-oxo-1,2-dihydropyrimidine-5-carboxylato-κ2 O 4,O 5)(4-oxido-2-oxo-1,2-dihydropyrimidin-3-ium-5-carboxylato-κ2 O 4,O 5)bis(1,10-phenanthroline-κ2 N,N′)gadolinium(III) dihydrate