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Electrochemical study of the reaction between progressively alkylated thiazine leucodyes and Fe(III) on a glassy carbon electrode
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| Zeitschriftentitel: | Canadian Journal of Chemistry |
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| Personen und Körperschaften: | , |
| In: | Canadian Journal of Chemistry, 74, 1996, 10, S. 1896-1902 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Canadian Science Publishing
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| Schlagwörter: |
| Zusammenfassung: | <jats:p> An electrochemical investigation on five progressively alkylated thiazine dyes in the presence of Fe(III) ions is reported. The theory of the catalytic regeneration mechanism involving an electrode reaction followed by a coupled chemical reaction is applied to derive kinetic parameters of homogeneous reaction. The second-order rate constant for the reaction of thiazine leucodyes with Fe(III) ions was found to increase from 0.25 × 10<jats:sup>4</jats:sup> to 1.6 × 10<jats:sup>4</jats:sup> dm<jats:sup>3</jats:sup> mol<jats:sup>−1</jats:sup> s<jats:sup>−1</jats:sup> upon monomethylation and to vary from 0.7 × 10<jats:sup>4</jats:sup> for the dimethyl derivative to 1.4 × 10<jats:sup>4</jats:sup> dm<jats:sup>3</jats:sup>mol<jats:sup>−1</jats:sup> s<jats:sup>−1</jats:sup> for the tetramethyl one. The electron-donating nature as well as the hydrophobic characteristics of the methyl group influence the kinetics of the homogeneous reaction. Key words: cyclic voltammetry, thiazine dyes, ferric ion, catalytic regeneration, kinetics </jats:p> |
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| Umfang: | 1896-1902 |
| ISSN: |
0008-4042
1480-3291 |
| DOI: | 10.1139/v96-213 |