The construction of solid-state architectures from predesigned building blocks has attracted much attention over the past decades owing to its potential applications. Although the design and synthesis of coordination polymers is well documented now, the predictable supramolecular assemblies based on non-covalent interactions such as hydrogen bonds and ππ stacking interactions are still questionable. Nevertheless, some control over the type and topology of the product generated from the self-assembly of metallo-organic species can be achieved by careful choice of the ligands. From the reaction between copper(II) nitrate trihydrate, 2,3-bis(2-pyridyl)pyrazine (dpp), and acetylacetonate (Hacac) in ethanol or tetrahydrofuran solution two mixed ligand copper(II) compounds [Cu(acac)(NO3)(dpp)] (1) and [Cu2(acac)2(NO3)(dpp)(H2O)]NO3 (2) have been isolated. Crystals of both compounds are monoclinic, for 1: P21/n, a = 12.9681(5), b = 10.6883(3), c = 13.9172(4)Å, β = 93.472(3)°, for 2: P21/c, a = 14.3459(6), b = 12.1678(6), c = 15.9241(9)Å, β = 95.003(5)°. In mononuclear neutral complex 1 and binuclear monocationic complex 2, metal atoms have a square-pyramidal N2O3 surrounding. The aromatic multifunctional dpp ligand adopts chelating (1) and bis-chelating (2) N,N′- coordination mode, while acac serves as monodeprotonated O,O′-chelating ligand. The nitrate anion occupies the apical position of the Cu(II) atom in 1 and one of copper atoms in 2; the second Cu(II) atom in 2 coordinates a water molecule. The crystal structures of these compounds reveal the variety of supramolecular interactions such as weak coordination bonds, hydrogen bonds, and stacking interactions. In 1, two neighboring complexes form a centrosymmetric dimer due to weak additional interaction of the metal atom and uncoordinated pyridine moiety of dpp, Cu···N3 = 3.254 Å, as well as π-π stacking interactions between aromatic rings of dpp ligands (interplanar separation equals 3.427 Å, and centroid···centroid distance 3.850 Å) as shown in Fig.1 Structure of 2 reveals the ribbons formed due to stacking-like interactions involving metallocycles. The Cu···Cu separations in the ribbon equal 3.762 and 4.094 Å, and relevant interplanar distances between overlapping fragments are 3.408 and 3.567 Å for Cu1 and Cu2, respectively. Hydrogen bonds between coordinated nitrate anions and water molecules unite such ribbons in layers parallel to the ac crystallographic plane.fgiureComplex 1 Complex 2