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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 38, Number 4
JKCSEZ 38(4)
August 20, 1994 

 
Title
Oxidation Reaction of Hydrazobenzene by Activated Catalysts of Pentadentate Schiff Base Cobalt(Ⅲ)-O2 Complexes in Methanol Solvent

메탄올 용매에서 산소 첨가된 다섯자리 Schiff Base Cobalt(Ⅲ) 착물들의 활성 촉매에 의한 Hydrazobenzene의 산화반응
Author
Yun-Jeong No, Dong-Hwa Park, Ki-Hyung Chjo, Sang-Bock Kim, Yong-Kook Choi

노윤정, 박동화, 조기형, 김상복, 최용국
Keywords
Abstract
산소가 포화된 메탄올 용액에서 다섯자리 Schiff base cobalt(Ⅱ) 착물인 [Co(Ⅱ)(Sal-DPT)(H2O)] 와 [Co(Ⅱ)(Sal-DET)(H2O)]들의 활성촉매에 의한 hydrazobenzene의 산화 주생성물은 trans-azobenzene(trans-AB)이다. UV-visible분광광도법에 의해 이들 반응의 속도상수 k=6.06 × 10-3 sec-1 및 2.50 × 10-3 sec-1로 주어짐을 알았다. 균일 산화 활성촉매에 의한 H2AB의 산화반응 메카니즘은 다음과 같은 과정으로 주어진다. H2AB + Co(Ⅱ)(L)(H2O) + O2 ↔ Co(Ⅲ)(L)O2·H2AB + H2O → Co(Ⅱ)(L) + trans-AB + H2O2 (L: Sal-DPT and Sal-DET)

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)

Page
302 - 308
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