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Tetradentate schiff base cobalt(Ⅱ) complexes; Co(SED), Co(SND) and Co(SOPD) have been prepared, these complexes have react with dry oxygen in DMSO to form oxygen adducts cobalt(Ⅲ) complexes; [Co(SED)(DMSO)]2O2, [Co(SND)(DMSO)]2O2 and [Co(SOPD)(DMSO)]2O2. It seems to be that the oxygen adducts cobalt(Ⅲ) complexes have heexa coordinated octahedral configration with tetradentate schiff base cobalt (Ⅱ), DMSO and oxygen, and the mole ratio of oxygen to cobalt(Ⅱ) complexes are 1 : 2, these complexes have been identified by IR-Spectra, T.G.A., magnetic susceptibilitis and elemental analysis of C.H.N. and Cobalt. The redox reaction process of Co(SED), Co(SND) and Co(SOPD) complexes was investigated by cyclic voltammetry with glassy carbon electrode in 0.1M TEAP-DMSO. The results of redox reaction process of Co(Ⅱ) / Co(Ⅲ) and Co(Ⅱ) / Co(Ⅰ) for cobalt(SED) and cobalt(SOPD) complexes and Co(Ⅱ) / Co(Ⅲ) process for cobalt(SND) complex are reversible process but Co(Ⅱ) / Co(Ⅰ) process of Cobalt(SND) complex is irreversible, and oxygen adduct complexes to quasi reversibly with oxygen should be very closed related to the redox potentials of range, Epc = -0.80∼-0.89V and Epa = -0.70∼-0.76V.
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