The work is related to cobalt nanoparticles. The method which enable obtaining the particles with small size distribution is presented. The thermal decomposition of octacarbonyldicobalt in solution in the presence of trioctylphosphane oxide (TOPO) and oleic acid (OA) as a coordinating ligands was used. The size was determined by SAXS method. The method provides a clean route for the preparation of the material since elemental cobalt is the only nonvolatile product of the reaction: [Co2(CO)8] -> 2Co + 8CO. The resulting powder is highly susceptible to magnetic fields generated by a small permanent magnet, suggesting that it consisted of metallic cobalt. The particles showed large Voigth and Faraday effect. The different type of nanoparticle coating (by the ligand exchange reaction) on particles organization and solubility in varies organic solvents was studied.

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