Novel Co(III) complexes with general formula, [Co(chel)(PBu3)]ClO4.H2O, where chel = 5-Brsalophen, 5-NO2salophen, 5-MeOsalophen and 4-MeOsalophen, were synthesised and characterised. The spectroscopic and electrochemical properties of these complexes and [Co(salophen)(PR3)]ClO4.H2O (R = PBu3 and PPh3) complexes were investigated.