Kinetics and Mechanism of Electron Transfer Reaction of an Adipato Bridged Iron(III)-Salen Complex with Dithionite Ion in Perchloric Acid Medium

Ukoha, P. O.; Atiga, Simeon; Ujam, Oguejiofo T.; Asegbeloyin, Jonnie N.; Okpareke, Obinna C.; Okereke, Solomon O. E.

doi:10.5562/cca2584

Cited by 8 publications

(11 citation statements)

References 22 publications

(29 reference statements)

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“…Similar results were reported in the oxidation reaction of adipato bridged iron(iii)-salen complex with dithionite ion in an acidic medium by Ukoha et al 2015).…”

Section: Change In Hydrogen Ion Concentrationsupporting

confidence: 89%

Kinetics and Oxidation of the Reactions Between Dithionite Ion and Nitrocellulose in Acidic Phase

Umoru

EFFIONG²

2022

FJS

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Kinetics and oxidation of the reactions between dithionite ion and nitrocellulose was studied in acidic phase under the condition of excess [S2O42-] at T = 29 ± 1oC, [H+] = 1.0 × 10-2 mol dm-3, I = 1.0 mol dm-3 (Na2SO4) and λmax = 360 nanometer. The oxidation-reduction reasult for NC+ with dithionite ion displayed a 1:2 mole ratio. The reaction showed first order in terms of the oxidant [NC+] as well as first order in terms of the reductant [S2O42-]. The rate of reaction indicated a first order relationship in terms of acid ion concentration. The reaction rate law is given as: k2 = a + b [H+] where a = Intercept, b = Slope. The rate of reaction increased with an increase in the moles of sulphuric acid added. This implies great stability of NC+ in an aqueous acidic medium. The rate decreased with an increase in sodium sulphate concentration. The spectroscopic investigation gave no signal for the formation of an intermediate complex. Based on the results obtained for the non-formation of intermediate complex, a plausible mechanism that favoured the outer-sphere mechanism was proposed for the studied reaction.

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“…Similar results were reported in the oxidation reaction of adipato bridged iron(iii)-salen complex with dithionite ion in an acidic medium by Ukoha et al 2015).…”

Section: Change In Hydrogen Ion Concentrationsupporting

confidence: 89%

Kinetics and Oxidation of the Reactions Between Dithionite Ion and Nitrocellulose in Acidic Phase

Umoru

EFFIONG²

2022

FJS

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“…Where A∞ = final absorbance, at = absorbance at time t, A0 = Initial absorbance and k1 = pseudo-first order rate constant as reported elsewhere (Onu et al 2015, Ukoha et al 2015).…”

Section: Kinetic Measurementmentioning

confidence: 99%

Electron transfer reaction of Tris(1,10-phenanthroline) cobalt(III) complex [Co(phen)3]3+ and thiosulphate ion (S2O32âˆ’) in an aqueous acidic medium

Osunkwo

Nkole

Onu

et al. 2018

IJAC

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The electron transfer reaction of Tris (1,10-phenanthroline)cobalt(III) complex by thiosulphate ion has been studied in an aqueous acidic medium. Stoichiometric determination shows that for one mole of the oxidant that was reduced, one mole of the reductant was consumed; the reaction conforms to an overall equation: 2[Co(phen)3]3+ + 2S2O32− → 2[Co(phen)3]2+ + S4O62− Kinetics study carried out under pseudo-first order condition shows that the reaction proceeded via a one-way acid-dependent pathway and was third order overall; zero order with respect to the oxidant concentration, second order with respect to the reductant concentration and first order with respect to the hydrogen ion concentration. The empirical rate law conforms to the equation: − {Co(phen)3}3+] = a [H+] [S2O32−]2 ‘a’ = 128.26 dm6 mol−2 s−1: at [H+] = 2.0 × 10−2 mol dm−3, µ = 0.4 mol dm−3 (NaCl), T = 28 ± 1˚C and λmax = 495 nm.The rate of reaction increased at the increase in ionic strength and at the decrease in medium dielectric constant. Added cations and anions catalyzed and inhibited the reaction rates respectively. The Michaelis-Menten plot of 1/k1 versus 1/[S2O32−]2 started from the origin. Hence based on spectroscopic investigation, thermodynamic information from temperature dependence studies and kinetic evidence from Michaelis–Menten plots and the interactions with added ions, an outer-sphere mechanism has been rationalized for this reaction. The mechanistic scheme of the reaction was proposed via the stated mechanistic route.

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“…Added cation (NH4 + ) led to an increase in the rate of the reaction while added anion (HCOO -) decelerated the rate (Table 3). The cation catalysis and anion inhibition detected have been linked with the outer sphere electron transfer process [21]. The active participation of free radical in the reaction was negative.…”

Section: Resultsmentioning

confidence: 94%

Reduction of tris(2,2’-bipyridine)cobalt(III) complex by thiosulphate ion in an aqueous acidic medium

Osunkwo¹,

Nkole

2021

Preprint

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The reduction of tris(2,2-bipyridine)cobalt(III) complex by thiosulphate ion in an aqueous acidic medium gave a notable outcome. The stoichiometric evaluation indicates that one mole of the reducing agent has been consumed by one mole of the oxidant, and the reaction complies with an overall equation: 2[Co(bpy)3]3+ + 2S2O32− 2[Co(bpy)3]2+ + S4O62− The kinetics study conducted under a pseudo-first-order method shows that the rate of the reaction was acid-reliant and third-order overall; zero-order in the [oxidant], second-order in the [reductant], and first-order in the hydrogen ion concentration. The empirical rate expression complies with the equation:− [Co(bpy)33+] = a [H+][S2O32−]2‘a’ = 77.82 dm6 mol−2 s−1; at [H+] = 2.0 × 10−2 mol dm−3, µ = 0.4 mol dm−3 (NaCl), T = 28 ± 1˚C and λmax = 560 nm.With increased ionic strength and decreased medium dielectric constant, the reaction rate increased. The inclusion of cations and anions accelerate and constricted the reaction rates respectively. Spectroscopic examination and kinetic evidence indicate an outer sphere mechanism, and the mechanism was therefore proposed via an outer-sphere route.

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Kinetics and Mechanism of Electron Transfer Reaction of an Adipato Bridged Iron(III)-Salen Complex with Dithionite Ion in Perchloric Acid Medium

Cited by 8 publications

References 22 publications

Kinetics and Oxidation of the Reactions Between Dithionite Ion and Nitrocellulose in Acidic Phase

Kinetics and Oxidation of the Reactions Between Dithionite Ion and Nitrocellulose in Acidic Phase

Electron transfer reaction of Tris(1,10-phenanthroline) cobalt(III) complex [Co(phen)3]3+ and thiosulphate ion (S2O32âˆ’) in an aqueous acidic medium

Reduction of tris(2,2’-bipyridine)cobalt(III) complex by thiosulphate ion in an aqueous acidic medium

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