Three tetrameric cobalt(II)-pseudohalide complexes have been structurally and magnetically characterized. Compounds I and 2 are isomorphous and exhibit the general formula [CO2(dpk . OH)(dpk . CH3O)(L)(H2O)](2)A(2). 4H(2)O where dpk = di-2-pyridyl ketone, L = N-3(-) and A = BF4- for 1, and L = NCO- and A = ClO4- for 2. The ligands dpk . OH- and dpk . CH3O- result from solvolysis and ulterior deprotonation of dpk in water and methanol, respectively. Both compounds exhibit cationic tetramers consisting of a dicubane-like core with two missing vertexes where the Co(Il) ions are connected through end-on pseudohalide and oxo-bridges. A similar , tetranuclear core has been found for 3 whose formula is [Co-2(dpk . OH)(dpk . CH3O)(NCO)(2)](2). In this case, the tetramers are neutral and exhibit a terminal cyanate in place of the coordinated molecule of water for 1 and 2. The tetrameric units for 2 and 3 represent the first examples of any kind of cubanes exhibiting cyanate bridges as well as the first Co(II) compounds exhibiting intermetallic bridges through these pseudohalide. groups. Measurements of the magnetic susceptibility indicated the presence of ferromagnetic Co-II-Co-II interactions in the three compounds.