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KMID : 1059519890330020192
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Journal of the Korean Chemical Society
1989 Volume.33 No. 2 p.192 ~ p.202
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Studies on the Electrochemical Properties of Oxygen Adducts Tetradentate Schiff Base Cobalt (Ⅱ) Complexes in Aprotic Solvents (Ⅱ)
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Chjo Ki-Hyung
Chung Jin-Soon
Ham Heui-Suk
Seo Seong-Seob
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Abstract
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Tetradentate schiff bases cabalt (Ⅱ) complexes; Co(SED) and Co(ο-BSDT) were synthesized and these complexes allowed to reaction with dry oxygen to form oxygen adduct cobalt(Ⅲ) complexes such as [Co(ο-BSDT)(DMSO)]2O2, [Co(SED)(Py)]2O2 and [Co(ο-BSDT)(Py)]2O2 in DMSO and pyridine solutions. It has been found that the oxygen adduct cobalt(Ⅲ) complexes have hexacoordinated octahedral configuration with tetradentate schiff base cobalt(Ⅱ), DMSO or pyridine and oxygen, and the mole ratio of oxygen to cobalt(Ⅱ) complexes are 1:2. The redox processes, were investigated for Co(SEDT) and Co(ο-BSD) complexes in 0.1M TEAP-DMSO and 0.1M TEAP-pyridine by cyclic voltammetry with glassy carbon electrode. As a result the redox processes of Co(Ⅱ)/Co(Ⅲ) and Co(Ⅱ)/Co(Ⅰ) found to be reversible or quasi-reversible for non uptake oxygen complexes but oxygen adduct complexes found to be irreversible processes and reaction processes of oxygen for oxygen adduct complexes are quasi-reversible process, the potential range was Epc = -0.85 ∼-1.19V and Epa = -0.74∼-0.89V.
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