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In the title compound, diaquabis[2,4,5,6(1H,3H)-pyrimidinetetrone 5-oximato]copper(II) dihydrate, [Cu(C4H2N3O4)2(H2O)2].2H2O, the coordination geometry about the Cu atom is a distorted octahedron. The Cu atom is bonded to the N atoms of the isonitroso groups and to two carbonyl O atoms of the two violurate ligands in the equatorial plane, and to two water molecules in axial positions. The crystal structure is stabilized by a three-dimensional network of N—H...O and O—H...O intermolecular hydrogen bonds. The structure was originally determined based on Weissenberg film data taken using Cu radiation [Hamelin (1972). Acta Cryst. B28, 228–235].

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Crystallographic Information File (CIF)
Contains datablocks global, CuViol

CCDC reference: 126689

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