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Título: | Kinetics of the oxidation of L-ascorbic acid by diaquatetraamminecobalt(III) in acidic aqueous solution. Application of the Fuoss model and the Marcus-Sutin cross-relationship for electron-transfer processes |
Autor: | Martínez, P.; Zuluaga, J.; Noheda Marín, Pedro CSIC ORCID ; van Eldik, R. | Fecha de publicación: | 1992 | Editor: | Elsevier | Citación: | Inorganica Chimica Acta 195 : 249-253 (1992) | Resumen: | The kinetics of the oxidation of L-ascorbic acid by diaquatetramminecobalt(II1) was studied as a function of pH, L-ascorbic acid concentration, ionic strength and temperature using a stopped-flow technique. The rate of the process was found to be first order with respect to both redox partners, whereas the [H+] concentration showed a retarding influence. The kinetic data are interpreted in terms of rate-determining oxidation of the deprotonated ascorbate anion, for which k=(3.42+0.15) x lo-’ M-’ s-r at 25 “C, AEZf =81+6 kJ mol-’ and AS+ =1+20 J K-r mol-‘. The ion-pair formation theory of Fuoss and the Marcus-Sutin cross-relationship for electron transfer were applied to this redox process to estimate the ion-pair formation constant, the rate constant for electron transfer and the self-exchange rate constant for the Co(NH3)4(H20)~+n+ couple. | Versión del editor: | https://doi.org/10.1016/S0020-1693(00)85320-7 | URI: | http://hdl.handle.net/10261/179807 | DOI: | 10.1016/S0020-1693(00)85320-7 | ISSN: | 0020-1693 |
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