In the title compound, [Co(C10HTN202)2(H20)2], prepared from neocupferron and (NH4)2[Co(SO4)2(H20)6], the CO Il ion has slightly distorted octahedral coordination defined by six O atoms from the two bidentate ligands and the two water molecules, in a cis arrangement [Co--O 2.073 (2)-2.124 (3),~]. The molecule has crystallographic C2 symmetry. The plane of the nitrosohydroxylaminato group is twisted out of the plane of the naphthyl ring.

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The title compound, [Ni(C6HsN202)e(CH3OH)2 ], contains an Ni atom in a six-coordinate state. The Ni atom displays distorted octahedral coordination. The Nnitroso-N-phenylhydroxylaminato anions lie in a trans position to each other, forming the equatorial plane, and the methanol ligands occupy the axial positions.

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The Co N atom in the title compound, diaquahis [ 2,4,5,6 ( 1 H, 3H)-pyrimidinetetrone 5 -oximato ]cobalt(II) dihydrate, [Co(C4HEN30.~)2(H20)2].2H_~O, is six-coordinate in a distorted octahedral environment. It is bonded to the two N atoms of the isonitroso groups and to two carbonyl O atoms of the two 5-isonitrosobarbiturate ligands, the four atoms constituting the equatorial plane. The two water O atoms occupy the axial positions. Molecules are linked by two types of hydrogen bond, N--H...O and O--H...O, involving water molecules. , diaquabis[2,4,5,6(1H,3H)-pyrimidinetetrone 5-oximato]copper(II) dihydrate, [Cu-(CaH2N3Oa)2(H20)2].2H20, the coordination geometry about the Cu atom is distorted octahedral. 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 Abstract In the title compound