Redox Kinetics and Mechanism of the Reactions of µ –Oxobis [aquobis (2,2’ – Bipyridine)] diruthenium (III) Ion and some Aliphatic Alcohols in Acidic Medium

Yahaya Mohammed; Sulaiman Ola Idris; David  Onu

doi:10.62050/ljsir2024.v2n2.289

Auteur/ices

Yahaya Mohammed
yahaya@nsuk.edu.ng

Department of Chemistry, Nasarawa State University, Keffi – Nigeria
Sulaiman Ola Idris
Department of Chemistry, Ahmadu Bello University, Zaria – Nigeria
David Onu
Department of Chemistry, Federal College of Education, Zaria – Nigeria

Mots-clés :

dielectric constant , free radicals , ionic strength , rate constant , stoichiometry

Résumé

The redox kinetics and mechanisms of the reactions of μ – oxobis[aquobis(2,2’ - bipyridine)]diruthenium (III) ion, [(bipy)₂(H₂O)RuORu(H₂O)(bipy)₂]⁴⁺ (hereafter denoted as Ru₂O⁴⁺or [(H₂O)₂(bipy)₄Ru₂O]⁴⁺) and some primary aliphatic alcohols was studied in perchloric acid medium, [H⁺] = 5.0 x 10^-3 mol dm^-3, ionic strength (I), = 0.5 mol dm^–3 (NaClO₄), temperature (T) = 31 ± 1°C and wavelength ,λ_max = 660 nm. The reactions, which led to the formation of corresponding aldehydes had a stoichiometry of 1:1, were all first order with respect to each reactant, and second order overall. The reactions proceeded in the absence of acid but when acid was added, the reactions ceased. Varying the ionic strength and dielectric constants of the reaction medium had no effect on the reaction. Added ions catalysed the reaction and free radicals were identified in the reaction mixtures in the course of the reactions. There was no evidence for the formation if intermediate complex in the course of the reaction. The order of reactivity is of the order CH₃OH > C₂H₅OH > C₃H₇OH Based on the results, it is suggested that all the reactions proceeded through the outer – sphere electron transfer mechanism and a plausible mechanism that represented all the reactions is proposed.

Dimensions

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Redox Kinetics and Mechanism of the Reactions of µ –Oxobis [aquobis (2,2’ – Bipyridine)] diruthenium (III) Ion and some Aliphatic Alcohols in Acidic Medium

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