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In the title compound, [Co2(C7H8NO)3(N3)3]·CH3CN, the two CoII ions in the dinuclear complex have different coordination environments, both in a distorted octahedral geometry. One CoII atom is coordinated by three O atoms from the three 2-hydroxyethylpyridine (HEP) bridging ligands, two N atoms from two HEP ligands and one azido ligand, while the other CoII atom is coordinated by the same three O atoms, one N atom from an HEP ligand and two azido ligands. Weak intermolecular C—H...N hydrogen bonds link the dinuclear complexes into corrugated layers parallel to the bc plane. These layers are further packed with the formation of channels propagating in [010] and filled with the disordered [in a ratio 0.691 (13):0.309 (13)] acetonitrile solvate molecules.