The ionic complexes [C5H5Co(L)(Ph2PMe)I](+) [I](-) (L = Ph3P and Ph2PMe) were prepared by the reactions of cyclopentadienyl(triphenylphosphine)cobalt and cyclopentadienyl(methyldiphenylphosphine)cobalt diiodides with methyldiphenylphosphine. The treatment of these complexes with sodium tetraphenylborate results in the formation of [C5H5Co(L)(Ph2PMe)I](+)[BPh4](-) compounds.