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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.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks global, Co, Zn

hkl

Structure factor file (CIF format)
Contains datablock Co

hkl

Structure factor file (CIF format)
Contains datablock Zn

CCDC references: 128458; 128459

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