| Autor: |
JIN-HUAN SHAN, SHU-YING HUO, SHI-GANG SHEN, HAN-WEN SUN |
| Jazyk: |
angličtina |
| Rok vydání: |
2005 |
| Předmět: |
|
| Zdroj: |
Journal of the Serbian Chemical Society, Vol 70, Iss 4, Pp 585-592 (2005) |
| Druh dokumentu: |
article |
| ISSN: |
0352-5139 |
| Popis: |
The kinetics of oxidation of 1,2-propanediol and 1,2,3-propanetriol by dihydroxyditelluratoargentate(III) (DDA) were studied spectrophotometrically between 298.2 K and 313.2 K in alkaline medium. The reaction rate showed first order dependence on DDA and 1 < nap < 2 order on the reductant. It was found that the pseudo-first order rate constant kobs increased with increasing concentration of OH- and decreasing concentration of TeO42-. There is a negative salt effect and no free radicals were detected. In view of this, the dihydroxymonotelluratoargentate(III) species is assumed to be the active species. A plausible mechanism involving a two-electron transfer is proposed and the rate equations derived from the mechanism can explain all the experimental results. The activation parameters, as well as the rate constants of the rate-determining step were calculated. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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