산소가 포화된 메탄올 용액에서 다섯자리 Schiff base cobalt(II) 착물인 [Co(II)(Sal-DPT)(H$_2$O)] 와 [Co(II)(Sal-DET)(H$_2$O)]들의 활성촉매에 의한 hydrazobenzene(H$_2$AB)의 산화 주생성물은 trans-azobenzene(trans-AB)이다. UV-visible분광광도법에 의해 이들 반응의 속도상수 $k=6.06{ imes}10^{-3}sec^{-3}$ 및 $2.50{ imes}10^{-3}sec^{-1}$로 주어짐을 알았다. 균일 산화 활성촉매에 의한 H$_2$AB의 산화반응 메카니즘은 다음과 같은 과정으로 주어진다. H$_2$AB + Co(II)(L)(H$_2$O) + O$_2$ $ ightleftharpoons^K_{methanol}Co(III)(L)O_2{cdot}H_2AB + H_2Olongrightarrow^{k}Co(II)(L) + trans-AB + H_2O_2$ (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)(H$_2$O)] and [Co(II)(Sal-DET)(H$_2$O)] in oxygen-saturated methanol solvent. The oxidation product of hydrazobenzene(H$_2$AB) was trans-azobenzene(trans-AB). The rate constants of oxidation reaction measured by UV-visible spectrophotometry were observed as $6.06{ imes}10^{-3}sec^{-1}$ for [Co(II)(Sal-DPT)(H$_2$O)] and $2.50{ imes}10^{-3}sec^{-1}$ for [Co(II)(Sal-DET)(H$_2$O)]. The mechanism of oxidation reaction for H$_2$AB by homogeneous activated catalysts has been proposed as following. H$_2$AB + Co(II)(L)(H$_2$O) + O$_2$ $ ightleftharpoons^K_{MeOH}Co(III)(L)O_2{cdot}H_2AB + H_2Olongrightarrow^{k}Co(II)(L) + trans-AB + H_2O_2$ (L: Sal-DPT and Sal-DET)
