{"title":"Kinetics and mechanism of the redox reaction between catechol and trisoxalatocobaltate (III) ion in aqueous acid medium","authors":"S. Mamman, J. Iyun","doi":"10.4314/NJCR.V9I1.35566","DOIUrl":null,"url":null,"abstract":"The kinetics of the reduction of [Co(Ox) 3 ] 3- with catechol has been studied in aqueous acid (HClO 4 ) medium at I = 1.00moldm -3 (NaClO 4 ) and T=26.3±0.1°C. Two moles of oxidant were consumed by one mole of reductant. The reaction is second order overall, first order in both oxidant and reductant and shows a first order direct acid dependence. Polymerisation test suggested the presence of free radicals as intermediates in the reaction. The kinetic data are consistent with the following equation: -d/2dt[Co(Ox) 3 3- ] = k 2 [Co(Ox) 3 3- ][H 2 Q]. Where k 2 = k a [H + ]. The experimental results are in favour of the outer-sphere mechanism. Nigerian Journal of Chemical Research Vol. 9, 2004: 35-39","PeriodicalId":102130,"journal":{"name":"Nigerian Journal of Chemical Research","volume":"20 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2006-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nigerian Journal of Chemical Research","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.4314/NJCR.V9I1.35566","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The kinetics of the reduction of [Co(Ox) 3 ] 3- with catechol has been studied in aqueous acid (HClO 4 ) medium at I = 1.00moldm -3 (NaClO 4 ) and T=26.3±0.1°C. Two moles of oxidant were consumed by one mole of reductant. The reaction is second order overall, first order in both oxidant and reductant and shows a first order direct acid dependence. Polymerisation test suggested the presence of free radicals as intermediates in the reaction. The kinetic data are consistent with the following equation: -d/2dt[Co(Ox) 3 3- ] = k 2 [Co(Ox) 3 3- ][H 2 Q]. Where k 2 = k a [H + ]. The experimental results are in favour of the outer-sphere mechanism. Nigerian Journal of Chemical Research Vol. 9, 2004: 35-39
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