| Titre : | Mechanistic investigation of uncatalyzed and osmium(VIII) catalyzed oxidation of guanidine by Ag(III) periodate complex in aqueous alkaline medium : a comparative kinetic approach (2009) |
| Auteurs : | Jyothi C. Abbar, Auteur ; Shekappa D. Lamani, Auteur ; Sharanappa T. Nandibewoor, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 48 N° 16, Août 2009) |
| Article en page(s) : | pp. 7550–7560 |
| Note générale : | Chemical engineering |
| Langues : | Anglais |
| Tags : | Guanidine hydrochlorid Diperiodatoargentate(III) Catalyzed oxidation |
| Résumé : | The oxidation of guanidine hydrochloride (GH) by diperiodatoargentate(III) (DPA) has been investigated both in the absence and presence of [Os(VIII)] catalyst in alkaline medium at a constant ionic strength of 0.10 mol dm−3 spectrophotometrically. The oxidation products were identified by spectral studies. The stiochiometry was same in both the cases, i.e., [GH]/[DPA] = 1:1. In both the catalyzed and uncatalyzed cases, the order of the reaction with respect to [DPA] was unity while the order with respect to [GH] was <1 over the concentration range studied. The rate increased with an increase in [OH−] and decreased with an increase in [IO4−]. The order with respect to [Os(VIII)] was unity. Suitable mechanisms were proposed. The reaction constants involved in the different steps of the reaction mechanisms were calculated for both reactions. Kinetic experiments suggest that [Ag(H2IO6)(H2O)2] is the reactive silver(III) species and [OsO4(OH)2]2− is the reactive Os(VIII) species. |
| En ligne : | http://pubs.acs.org/doi/abs/10.1021/ie900691z |
