ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 34, Number 1
JKCSEZ 34(1)
February 20, 1990 

Pentadentate Schiff base cobalt(Ⅱ) complexes; Co(Ⅱ)(Sal-DET) and Co(Ⅱ)(Sal-DPT) were synthesized and these complexes were allowed to react with dry to form oxygen adducts of cobalt(Ⅱ) complexes such as [Co(Ⅲ)(Sal-DET)]2O2 and [Co(Ⅲ)(DPT)]2O2 in aprotic solvents. These complexes have been identified by IR spectra, TGA, DSC, magnetic susceptibility measurements, and elemental analysis. It has been found that the oxygen adadduct complexes of μ-peroxo type have hexaccordinated octahedral configuration with pentadentate schiff base cobalt(Ⅱ) and oxygen, but the mole ratio of oxygen to cobalt(Ⅲ) complexes of first step for oxygen adduct formation reaction of cobalt(Ⅱ) complexes in aprotic solvents are 1:1. The redox reaction processes of Co(Ⅱ)(Sal-DET), Co(Ⅱ)(Sal-DPT), and oxygen adduct of cobalt(Ⅱ) complexes were investigated by cyclic voltammetry and DPP method with glassy carbon electrode in 0.1M TEAP-DMSO and 0.1M TEAP-pyridine. As a result the reduction reaction processes of Co(Ⅲ)/Co(Ⅱ) and Co(Ⅱ)/Co(Ⅰ) for cobalt(Ⅱ) complexes and oxygen adducts of cobalt(Ⅱ) complexes are two irreversible steps of one eletron process, and reaction processes of oxygen for oxygen adducts complexes were quasireversible and redox range of potential was Epc = -0.97V∼-0.86V and Epa = -0.87V ∼ 0.64V.