Analysis of the Cambridge Structural Database and our previous studies have shown that the aromatic ligand 4,4'-diaminodiphenylmethane (dadpm) with a weaker donor ability than pyridyl-type ligands could coordinate to transition metal ions through an NH2 group, acting as a terminal ligand or through two NH2 groups, acting as a bridging ligand and forming various coordination compounds and supramolecular ensembles. The new coordination compound [Co(dadpm)2(H2O)2(NO3)2] was obtained by the reaction of cobalt(II) nitrate hexahydrate salt with the ditopic dadpm ligand in a MeCN/EtOH solvent mixture. The given mononuclear neutral complex crystallizes in the triclinic space group P-1: a=5.8352(5), b=9.4794(7), c=13.4138(9) Å; a=105.648(6), β=98.057(6)°, γ=105.819(7)°, V = 668.88(9) Å3. The Co(II) cation resides on an inversion center and adopts a slightly distorted octahedral geometry, with the set of N2O4 donor atoms resulting from pairs of dadpm and aqua ligands, and nitrate anions, all coordinating to the metal in monodentate mode and occupying the trans-positions.The crystal packing revealed that uncoordinated NH2 groups of the dadpm ligands form hydrogen bonds with the coordinating water molecules and nitrate-anions of adjacent complexes, generating supramolecular chains (Fig. 1).