It is well known that copper nitrate reacts with imidazole and 2-[(2-hydroxyethylimino) methyl] phenol that is a mixed-ligand binuclear complex with antimicrobial properties. The aim of the present paper is to determine the influence of introducing the mentioned above azomethine substituents in the salicylic fragment on the composition and structure of the complex. To this end, we have synthesized and studied the structural features of nitrate 4-bromo-2-[(2-hydroxyethylimino) methyl]-phenolo imidazolcopper (I) and nitrate-4-chloro-2-[(2-hydroxyethylimino ) methyl]-phenolo imidazolcopper (II) by means of X-ray analysis. The crystal structure of (I) and (II) contains practically isostructural complexes. In these complexes, the copper atom coordinates the deprotonated tridentate azomethines molecules and the nitrate ion. In complex (I), the coordination polyhedron of the copper atom is a distorted tetragonal pyramid. The bases of this pyramid are occupied by the atoms of phenolic and alcoholic oxygens of N1 nitrogen of the monodeprotonated azomethine molecule and N2 nitrogen atom of imidazole. The apical vertix of Cu1 coordination pyramid occupied by the O2N oxygen atom of the nitrate groups (Fig. 1). The lengths of the metal bonds with donor atoms in the pyramid base of complex (I) have the following values: Cu1-O1 1.901, Cu1-O2 2.032, Cu1-N1 1.942, Cu1-N2 1.970 Ǻ, and the Cu1-O2N distance is 2.808 Ǻ. The coordination polyhedron of the copper atom in II is a bipyramid (4 +1 +1). The bases of this pyramid are occupied by the same atoms as in complex (I), the distance being close to the values of (I): Cu1O1 1.899, Cu1-O2 2.038, Cu1-N1 1.929, Cu1-N2 1.956 Ǻ. In this complex the axial vertices of the bipyramid are occupied by the O2N oxygen atoms of the nitrate groups and the bridging Cl1 chlorine atom of the neighboring complex connected to the initial one with the distances of 2.795 and 3.252 Å, respectively. Thus, by the senter of symmetry in the complex (II) centrosymmetric dimers with bridging chlorine atoms are formed (II) (Fig. 2).figureFig. 1. Molecular structure of compound (I). Fig. 2. View of the centrosymmetric dimer.In nitrate groups the crystals of the hydrogen bonds join complexes (I) and (II) in the threedimensional framework.