Mechanistic investigation of uncatalyzed and osmium(VIII) catalyzed oxidation of guanidine by Ag(III) periodate complex in aqueous alkaline medium / Jyothi C. Abbar in Industrial & engineering chemistry research, Vol. 48 N° 16 (Août 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 16 (Août 2009) . - pp. 7550–7560 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 Type de document : texte imprimé Auteurs : Jyothi C. Abbar, Auteur ; Shekappa D. Lamani, Auteur ; Sharanappa T. Nandibewoor, Auteur Année de publication : 2009 Article en page(s) : pp. 7550–7560 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : 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 [article] Mechanistic investigation of uncatalyzed and osmium(VIII) catalyzed oxidation of guanidine by Ag(III) periodate complex in aqueous alkaline medium : a comparative kinetic approach [texte imprimé] / Jyothi C. Abbar, Auteur ; Shekappa D. Lamani, Auteur ; Sharanappa T. Nandibewoor, Auteur . - 2009 . - pp. 7550–7560. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 16 (Août 2009) . - pp. 7550–7560 Mots-clés : 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

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