Abstract. X-ray single crystal diffraction studies reveal that the nickel complex and cobalt complex are isostructural.In the title crystal structure, the Ni atom lying on ac rystallographic inversion center is six-coordinated by two N,O-bidentate 2-methyl-1H-imidazole-4,5-dicarboxylic acid mono-anionic ligands and two water molecules. As in the Co complex, two coordinated water molecules occupy the apical sites, and the equatorial plane contains two bidentate 2-methyl-1H-imidazole-4,5-dicarboxylic acid mono-anionic ligands. Rich O−H···O, N−H···O and C−H···Ohydrogen bonds link the mononuclear nickel complex into a3 Ds upramolecular structure. The mean distances Ni-Oand Ni-Nof2.0794 Å and 2.0528 Å,respectively, are smaller than that of Co-O(2.1179 Å)and

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In the title compound, C17H18ClN3O3, the dihedral angle between the planes of the two benzene rings is 1.03 (7)°. The overall conformation of the mol­ecule is influenced, in part, by electron delocalization and by an intra­molecular bifurcated O—H⋯(O,N) hydrogen bonds. The O atoms of the nitro group, one of which serves as an H bond acceptor, are disordered over two sets of sites with refined occupancies of 0.56 (3) and 0.44 (3).

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