{"title":"儿茶酚与三草酸钴酸盐(III)离子在酸性水介质中氧化还原反应的动力学和机理","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":"{\"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}","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}
Kinetics and mechanism of the redox reaction between catechol and trisoxalatocobaltate (III) ion in aqueous acid medium
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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