Aromatic nitrogen-containing heterocycles are a subject of growing interest because they can combine their coordination possibility with the formation of stacking interactions in coordination compounds. Design and engineering of metal-organic materials with specific properties using molecular building blocks approach is possible only by understanding the interplay of different interactions involved in self-assembly processes. From a crystal engineering perspective, the advantage of copper(II) ions is the predictable coordination algorithm of metal and possibility of ligand exchange/replacement at axial positions. Herein, we report the structures of two novel copper(II) coordination polymers, {[Cu4(dpp)2(ox)(NO3)6(H2O)2]•1.2(H2O)}n (1) and {[Cu(dpp)(NO3)](NO3)•(H2O)}n (2), that have been obtained by the reaction of copper(II) nitrate trihydrate with an aromatic multifunctional ligand 2,3-bis(2-pyridyl)pyrazine (dpp) and oxalic acid (H2ox) in a mixture of MeCN/MeOH for 1 and acetylacetonate (Hacac) in MeOH/THF for 2. Compound 1 crystallizes in the triclinic space group P-1: a = 8.5878(5), b = 8.8927(4), c = 14.5873(8) Å, α = 75.489(4), β = 81.988(5), γ = 89.460(4)°, whereas compound 2 crystallizes in the monoclinic system, P21/n, a = 12.7799(8), b = 9.8365(7), c = 14.3827(8) Å, β = 111.017(7)°. In 1, the aromatic ligands unite Cu(II) ions in a centrosymmetric tetramer. Firstly, the neutral dpp ligand chelates to two symmetry-independent Cu(II) atoms and then an oxalate dianion joins such couples in the centrosymmetric tetramer through bis-chelate function. A terminal in tetramer Cu1 additionally coordinates water molecule and two NO3 anions, while Cu2 coordinates NO3 anion. The tetramers are extended into the ribbons along the a axis due to a bridging function of one nitrate anion, which coordinates simultaneously to Cu1 and Cu2 atoms of neighboring tetramers. The ribbons are H-bonded through coordinated and solvent water molecules into the layers parallel to the ac plane. The crystal packing reveals stacking interactions between dpp ligands of neighboring parallel layers. The Cu···Cu separations in the ribbon are 5.100 Å, 6.686 Å, and 6.634 Å through oxalate, dpp and bridging NO3, respectively.    In 2, dpp ligands bridge metal atoms into zigzag cationic chains along the a crystallographic axis. The Cu(II) atoms adjust a distorted N4O2 square-bipyramidal coordination environment accomplished by four N atoms of two bridging chelating dpp ligands and two O atoms of the nitrate anion coordinated in a chelate mode. The Cu···Cu separation along the polymeric zigzag chain is 6.878 Å and Cu···Cu distance between the next to nearest metals equals 9.836 Å. The parallel packing of chains create in the crystal cavities filled by H-bonded (NO3···H2O)2 clusters. Fragment of ribbons in 1 Packing of chains and anionic clusters in 2 Acknowledgement. Authors thank for financial support the Swiss National Science Foundation (SCOPES IZ73Z0_152404/1).