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metal-organic compounds
In the title compounds having the general formula [M(C7H4NO5)2(H2O)4], where M = ZnII, CoII and NiII, the coordination polyhedron around the metal atom is a slightly distorted octahedron involving one carboxy O atom from each p-nitrosalicylato ligand and the O atoms of the four water molecules. The mean M-Owater and the M-Ocarboxyl distances are 2.126 (1) and 2.047 (1) Å, respectively, for the Zinc complex, and 2.118 (1) and 2.052 (1) Å, respectively, for the cobalt complex. Centrosymmetric monomers are cross-linked via intermolecular hydrogen bonds.
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