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The electroreduction of alkyl iodides and polyiodides: The kinetic model of EC(C)E and ECE-EC(C)E mechanisms with included transfer coefficient variability |
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| Authors: | Przemys?aw T Sanecki Piotr M Skita? |
| Affiliation: | Faculty of Chemistry, Rzeszów University of Technology, ul. W. Pola 2, 35-959 Rzeszów, Poland |
| Abstract: | The cyclic voltammetry electroreduction of seven alkyl iodides was investigated in 0.3 M TBAP/DMF on glassy carbon electrode. The influence of carbon chain length and the number of iodine atoms in the molecule was examined. The two-electron reductive cleavage with iodine elimination was numerically resolved into one-electron consecutive steps. The mechanism of the process was discussed applying the mathematical EC(C)E and ECE-EC(C)E kinetic models with included transfer coefficient variability for one stage electroreduction of RI and two stage electroreduction of RI2, respectively. For electroreduction of diiodomethane the discrimination of elementary alpha parameter between two reduction stages was determined. |
| Keywords: | ETC(α) elementary cathodic transfer coefficient of single electron transfer step αstart the value of α at which its variability starts Estart &part α/&part E the value of E at which α variability starts Ii I current of step I summary current of steps SCE saturated calomel electrode DMF dimethylformamide TBAP tetrabutylammonium perchlorate GCE glassy carbon electrode ECE a kinetic sequence of electrochemical chemical and electrochemical steps app apparent (in footnote) |
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