The synergistic extraction of cobalt(II) complexes with toluene-3,4-dithiol (TDT) in presence of monobenzylamine (BA), dibenzylamine (DBA) and tribenzylamine (TBA) has been investigated. The stoichiometry of the adducts formed was established from the extraction data. Values of the formation constant,B ex, in presence of the amine ligands have been determined. It is found that the extraction ability decreases in the orderDBA TBA>BA.