Blue block crystals of title compound, [Cu(adi)(4-pyao)2]n 1 were obtained by blending the solution of copper (II) fluoride with 4-pyridine-aldoxime (4-pyao) and adipic acid (H2adi). X-ray single crystal structure analysis revealed that 1 crystallizes in the triclinic space group P-1 (No 2). The metal N2O2-square-planar geometry is completed by two N-pyridine and two carboxylic oxygen atoms. The adipate dianions act in the bis-monodentate coordination mode and bridge the copper cations giving rise to 1D polymeric chain, while the 4-pyao ligands co-ordinate via pyridine nitrogen atoms (Figure, left). The Cu···Cu separation across the carboxylic group in the polymeric tapes is equal to 9.692 Å. The tapes are associated in the H-bonded network via oxime OH-groups and carboxylic oxygen atoms (O(1)-H(1)···O(3)(x+1, y+1, z-1)=2.689(3) Å). The microstructure and mechanical properties of the compound in study were considered. Tendency to form a hexagonal faceting was observed for the (100) plane. The lateral planes form between them the characteristic angles of 120º. Crystals demonstrated the good mechanical properties. The Young modulus, E, and nanohardness, H values were typical for such materials [1]. The diminution of the peak load (Pmax) from 50 mN to 5 mN resulted in increase of these parameters: E=8.99 GPa and 12.12 GPa; H=0.41 GPa and 0.50 GPa for the first and second Pmax, respectively. This phenomenon is due to the well-known indentation size effect (ISO). Also, it was shown that the contribution of elastic-plastic recovery of material grows with respect to the plastic residual strain. Along with this the next mechanical behaviors were detected, namely, the absence of pop-ins on the P-h curves, the sliding steps and slide curves, the lack of cracks inside the indentations and in its neighbourhood.