Kinetics and mechanism of electron transfer reactions. Reduction of mercury(II) chloride by L-ascorbic acid in acid perchlorate and chloride media

1992 ◽  
Vol 17 (4) ◽  
pp. 343-347 ◽  
Author(s):  
Amita Agrawal ◽  
Som K. Mishra ◽  
Prem D. Sharma
Keyword(s):  
Electron Transfer ◽  
Ascorbic Acid ◽  
Kinetics And Mechanism ◽  
Transfer Reactions ◽  
Electron Transfer Reactions

Kinetics and mechanism of the oxidation of benzenediols and ascorbic acid by bis(1,4,7-triazacyciononane)nickel(III) in aqueous perchlorate media

1985 ◽  
Vol 63 (6) ◽  
pp. 1198-1203 ◽  
Author(s):  
A. McAuley ◽  
Lee Spencer ◽  
P. R. West
Keyword(s):  
Electron Transfer ◽  
Ascorbic Acid ◽  
Exchange Rate ◽  
Rate Constants ◽  
Outer Sphere ◽  
Kinetics And Mechanism ◽  
Hydrogen Ion ◽  
Transfer Reactions ◽  
Radical Ions ◽  
Electron Transfer Reactions

The reactions of the outer-sphere electron transfer reagent, Ni(9-aneN3)23+, (bis(1,4,7-triazacyclononane)nickel(III) ion) with ascorbic acid, hydroquinone, catechol, and resorcinol have been investigated. The absence of any proton related equilibria with the oxidant provides a means of ascribing the observed inverse hydrogen ion dependences to reactions of the dissociated ascorbate or quinolate ions, (HA−). The data are consistent with the rate-determining one-electron transfer reactions:[Formula: see text]followed by rapid oxidation of the radical ions formed. In the reaction with ascorbic acid, k1 ~ 0 and k2 (T = 25° C) = 5.2 × 106 M−1 s−1 (ΔH≠ = 10.1 ± 2.5 kcal mol−1, ΔS≠ = 5.7 ± 5.1 cal mol−1 K−1). For hydroquinone, catechol, and resorcinol, k1 = 2.9 × 103, 2.8 × 102, and ~0 M−1 s−1and k2 = 6.9 × 109, 4.1 × 109, and 2.8 × 108 M−1 s−1, respectively. These data have been combined with those from other similar reactions leading, by use of a Marcus correlation, to self-exchange rate constants for the HAsc−/HAsc• couple of 3.5 × 105 M−1 s−1 and for the H2Quin0/+ and H2cat0/+ systems of 5 × 107 and 2 × 107 M−1 s−1, respectively. The importance of the effect of bond-reorganisation on electron transfer is discussed.

Kinetic and Mechanism of Electron-Transfer Reactions: Silver (I) Catalyzed Oxidation of L-Ascorbic Acid by Peroxodiphosfate in Acetate Buffers

2014 ◽  
Vol 3 (1) ◽  
pp. 103-108 ◽  
Author(s):  
Narendra Soni ◽  
Riya Sailani ◽  
Chandra Khandelwal ◽  
Prem Sharma
Keyword(s):  
Electron Transfer ◽  
Ascorbic Acid ◽  
Transfer Reactions ◽  
Electron Transfer Reactions ◽  
Catalyzed Oxidation

Kinetics and mechanism of electron transfer reactions. Osmium(VIII) catalyzed oxidation of mannitol by hexacyanoferrate(III) in aqueous alkaline medium

2005 ◽  
Vol 30 (5) ◽  
pp. 546-551 ◽  
Author(s):  
Mridula Sharma ◽  
Gayatri Sharma ◽  
Beena Agrawal ◽  
C. L. Khandelwal ◽  
P. D. Sharma
Keyword(s):  
Electron Transfer ◽  
Alkaline Medium ◽  
Kinetics And Mechanism ◽  
Transfer Reactions ◽  
Aqueous Alkaline Medium ◽  
Electron Transfer Reactions ◽  
Catalyzed Oxidation

Kinetics and mechanism of electron-transfer reactions: ruthenium(III) chloride catalyzed oxidation of aspartic acid by peroxomonosulfate ion in acidic medium

2011 ◽  
Vol 105 (2) ◽  
pp. 249-259 ◽  
Author(s):  
Riya Sailani ◽  
Mridula Sharma ◽  
Deepmala Pareek ◽  
C. L. Khandelwal ◽  
P. D. Sharma
Keyword(s):  
Electron Transfer ◽  
Aspartic Acid ◽  
Acidic Medium ◽  
Kinetics And Mechanism ◽  
Transfer Reactions ◽  
Electron Transfer Reactions ◽  
Catalyzed Oxidation
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