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Kinetics and Mechanism of Oxidation of L-Ascorbic Acid by Pt(IV)(aq) in Aqueous Hydrochloric Acid Medium
Joint Authors
Patnaik, A. K.
Das, Smrutiprava
Senapati, Sadhana
Source
Advances in Physical Chemistry
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-5, 5 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-11-20
Country of Publication
Egypt
No. of Pages
5
Main Subjects
Abstract EN
Reduction of [PtCl6]2− by L-ascorbic acid (H2ASc) in 0.1 M aqueous acid medium has been investigated spectrophotometrically under pseudo-first order condition at [PtCl6]2− = 0.005–0.007 mol dm−3, 0.05 ≤ [H2ASc]/mol dm−3 ≤ 0.3, 298 K ≤ T ≤ 308 K, [H+] = 0.14 mol dm−3, I=0.5 mol dm−3.
The redox reaction follows the rate law: d[Pt(IV)]/dt = k[H2ASc][Pt(IV)], where k is the second-order rate constant and [H2ASc] is the total concentration of ascorbic acid.
Electron transfer from [H2ASc] to Pt(IV) center leading to the release of two halide ions and formation of the reaction products, square planner Pt(II) halide complex, and dehydrated ascorbic acid is suggested.
This redox reaction follows an outersphere mechanism as Pt(IV) complex is substituted inert.
Activation parameters were calculated corresponding to rate of electron transfer reaction k.
Activation parameters favor the electron transfer reaction.
American Psychological Association (APA)
Senapati, Sadhana& Das, Smrutiprava& Patnaik, A. K.. 2012. Kinetics and Mechanism of Oxidation of L-Ascorbic Acid by Pt(IV)(aq) in Aqueous Hydrochloric Acid Medium. Advances in Physical Chemistry،Vol. 2012, no. 2012, pp.1-5.
https://search.emarefa.net/detail/BIM-449234
Modern Language Association (MLA)
Senapati, Sadhana…[et al.]. Kinetics and Mechanism of Oxidation of L-Ascorbic Acid by Pt(IV)(aq) in Aqueous Hydrochloric Acid Medium. Advances in Physical Chemistry No. 2012 (2012), pp.1-5.
https://search.emarefa.net/detail/BIM-449234
American Medical Association (AMA)
Senapati, Sadhana& Das, Smrutiprava& Patnaik, A. K.. Kinetics and Mechanism of Oxidation of L-Ascorbic Acid by Pt(IV)(aq) in Aqueous Hydrochloric Acid Medium. Advances in Physical Chemistry. 2012. Vol. 2012, no. 2012, pp.1-5.
https://search.emarefa.net/detail/BIM-449234
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-449234