This article describes some complexes of cobalt(III) with γ-mercaptopropylamine, N, N-dimethyl-γ-mercaptopropylamme and N,N-dimethyl-β-mercaptoethylamine. The compounds are of stoichiometry [Co(ligand)3], [Co3(ligand)6]X (X=Cl or Br) and [Co(ligand)3]X3 (X=Cl or ClO4). γ-Mercaptopropylamine yields both chelated and non-chelated compounds while the N,N-dimethyl derivatives yield only non-chelated complexes. This behaviour contrasts with the results obtained with nickel(II). © 1984 Verlag Chemie GmbH.