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KMID : 1059519940380040302
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Journal of the Korean Chemical Society
1994 Volume.38 No. 4 p.302 ~ p.308
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Oxidation Reaction of Hydrazobenzene by Activated Catalysts of Pentadentate Schiff Base Cobalt(Ⅲ)-O2 Complexes in Methanol Solvent
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No Yun-Jeong
Park Dong-Hwa
Chjo Ki-Hyung
Kim Sang-Bock
Choi Yong-Kook
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Abstract
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Homogeneous catalytic oxidation of hydrazobenzene was investigated by employing pentadentate Schiff base complexes such as [Co(Ⅱ)(Sal-DPT)(H2O)] and [Co(Ⅱ)(Sal-DET)(H2O)] in oxygen-saturated methanol solvent. The oxidation product of hydrazobenzene(H2AB) was trans-azobenzene(trans-AB). The rate constants of oxidation reaction measured by UV-visible spectrophotometry were observed as 6.06 × 10-3 sec-1 for [Co(Ⅱ)(Sal-DPT)(H2O)] and 2.50 × 10-3 sec-1 for [Co(Ⅱ)(Sal-DET)(H2O)]. The mechanism of oxidation reaction for H2AB by homogeneous activated catalysts has been proposed as following. H2AB + Co(Ⅱ)(L)(H2O) + O2 ↔ Co(Ⅲ)(L)O2·H2AB + H2O → Co(Ⅱ)(L) + trans-AB + H2O2 (L: Sal-DPT and Sal-DET)
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KEYWORD
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