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KMID : 1059519890330030295
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Journal of the Korean Chemical Society
1989 Volume.33 No. 3 p.295 ~ p.303
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Electrochemical Properties of Oxygen Adducts Tetradentate Schiff Base Cobalt (II) Complexes in Pyridine (Ⅲ)
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Chjo Ki-Hyung
Seo Seong-Seob
Chon Dong-Chul
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Abstract
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Tetradentate Schiff base cobalt(Ⅱ) complex; Co(SND) and Co(SOPD) were synthesized, and these complexes were allowed to react with dry oxygen to form oxygen adducts cobalt(Ⅲ) complexes such as [Co(SND)(Py)]2O2 and [Co(SOPD)(Py)]2O2 in pyridine. These complexes have been identified by IR specta, T.G.A., magnetic susceptibilities measurements and elemental analysis. It has been found that the oxygen adducts coblat(Ⅲ) complexes have hexacoordinated octahedral configuration with tetradentate Schiff base cobalt(Ⅱ), pyridine and oxygen, and the mole ratio of oxygen to cobalt(Ⅱ) complexes are 1;2. The redox reaction processes of Co(SND)(Py)2 and Co(SOPD)(Py)2 complexes were investigated by cyclic voltammetry with glassy carbon electrode in 0.1M TEAP pyridine. The result of redox reaction processes of Co(Ⅲ)/Co(Ⅱ) and Co(Ⅱ)/Co(Ⅰ) for Co(SND)(Py)2 and Co(SOPD)(Py)2 complexes are reversible or quasi reversible process but oxygen adducts complexes are irreversible processes. Redox process for oxygen of oxygen adducts complexes was quasi reversible and redox range of potential was Epc = -0.96 ∼-1.03V and Epa = -0.78 ∼-0.80V.
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