{[Ni₂C₆H₂(COO)₄(H₂O)₄]·H₂O_2,5}_n binuclear coordination compound with supramolecular structure has been synthesized. The composition and chemical structure of the coordination compound have been determined by the elemental, X-ray, IR spectroscopic and differential thermal analyzes. The unit cell parameters have been determined by identifying the diffraction pattern and the inferred schematic structure of the two-dimensional polymer layer of the coordination polymer, which is the building block for all the studied coordination compounds from this series, has been given. The layers are connected with each other and shifted relative to each other depending on the direction and strength of the hydrogen bonds; and this leads to a change in the parameters of the unit cells. Thus, two-dimensional polymer layers (2D) are transformed into a 3D supramolecular structure

doi.org/10.32737/0005-2531-2023-2-163-168