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metal-organic compounds
In the title compound, [Co(C10H7O2N2)2(H2O)2], prepared from neocupferron and (NH4)2[Co(SO4)2(H2O)6], the CoII ion has slightly distorted octahedral coordination defined by six O atoms from the two bidentate ligands and the two water molecules, in the cis form [Co-O = 2.073 (2)-2.124 (3) Å]. The molecule has crystallographic C2 symmetry. The plane of the nitrosohydroxylaminato group is twisted out of the plane of the naphthyl ring.