trans-Diaquabis(nicotinamide-N¹)bis(4-nitrobenzoato-O)cobalt(II)

The title cobalt complex, [Co(C₇H₄NO₄)₂(C₆H₆N₂O)₂(H₂O)₂], is monomeric and centrosymmetric, and contains two water molecules, two 4-nitrobenzoate and two nicotinamide (NA) ligands, all acting as monodentate ligands. The four nearest O atoms around the Co atom form a slightly distorted square-planar arrangement, with a distorted octahedral coordination completed by the pyridine N atoms of the NA ligand at a distance of 2.134 (2) Å. The water molecules are hydrogen bonded to the carboxyl O atoms [O...O 2.634 (5) Å].

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