The development of the modern methodology of chemical synthesis creates premises for the obtaining of new materials with special properties. Complexes containing two or more metal ions are of increasing interest because of their relevance to biological systems and to molecular magnetism as they are ideal candidates for the synthesis of single-molecule magnets (SMMs) [1]. For the elaboration of the dimer the building block [Co(DН)2(H2O)Cl] and 1,2-bis-(4-pyridil)-ethane (bpetha) in a 2:1 ratio was used (methanol:dimethylformamide). Elemental analysis of the obtained compound was performed, the IR and UV/Vis spectra were registered, the X-ray study of the monocrystals of this compound was performed. The crystal data: P21/n, a=8.0490(2) Å, b=15.7980(5) Å, c=14.7400(5) Å, β=99.904(2)°, Z=4, R=0.0383. As a result of the determination of the crystal structure, the structural peculiarities of the complex were evidenced. It was found that two residues of dimethylglyoxime coordinate to the Co(III) tom in the equatorial plane through the nitrogen atoms of oxime groups while the axial positions are occupied by chlorine atoms and by a nitrogen atom of the neutral bpetha ligand bearing the bridging function. It links two [Co(DН)2Cl] structural unit into the centro-symmetrical dimer [Co2(DН)4(bpetha)Cl2] (Fig. 1). The H-bonded network of the crystal is formed from molecular compounds of Co(III) and solvation water molecules in a 1:1 ratio. Complex compounds of Co(III) of dimeric type are linked in chains by fine hydrogen bonds C-H···Cl, while the latter ones are linked in the layers through hydrogen bonds O-H···O formed with the participation of water molecules (Fig. 2). Considering the fine hydrogen bonds C-H···O(W), the layers are linked in the crystal and form a threedimensional network.figureFig. 1. The structure of the dimer [Co2(DН)4(bpetha)Cl2]figureFig. 2. Fragment of the H-bonded network for the complex [Co2(DН)4(bpetha)Cl2]. H2O.