Kinetics of oxidation of hydrogen peroxide by dioxo-bridged manganese(III,IV) complexes

1997 ◽  
pp. 4341-4344 ◽  
Author(s):  
Rupendranath Banerjee ◽  
Biswapriya Mondal ◽  
Shibnath Kundu
Keyword(s):  
Hydrogen Peroxide ◽  
Kinetics Of Oxidation ◽  
Oxidation Of Hydrogen ◽  
Kinetics Of

Kinetics of oxidation of hydrogen peroxide and ascorbic acid by a tribridged manganese(IV,IV) dimer in feebly acidic media

1999 ◽  
Vol 77 (4) ◽  
pp. 451-458 ◽  
Author(s):  
Anup Kumar Bhattacharya ◽  
Anath Bondhu Mondal ◽  
Anadi C Dash ◽  
G S Brahma ◽  
Rupendranath Banerjee
Keyword(s):  
Hydrogen Peroxide ◽  
Ascorbic Acid ◽  
Dehydroascorbic Acid ◽  
Kinetics Of Oxidation ◽  
First Order ◽  
Kinetic Activity ◽  
First Order Kinetics ◽  
Oxidation Of Hydrogen ◽  
Kinetics Of ◽  
Complex Ion

In weakly acidic, aqueous buffer (MeCO2-+ bipy), the complex ion [Mn2IV(μ-O)2(μ-MeCO2)(bipy)2(H2O)2]3+, 1 (bipy = 2,2prime-bipyridine), coexists in rapid equilibrium with its hydrolytic derivatives, [Mn2IV(μ-O)2(bipy)2(H2O)4]4+, 2, and [Mn2IV(μ-O)2(μ-MeCO2)(bipy)(H2O)4]3+, 3. The solution quantitatively oxidizes hydrogen peroxide to oxygen and ascorbic acid to dehydroascorbic acid, itself being reduced to MnII. In the presence of excess reductant, the reactions follow simple first-order kinetics with no evidence for the accumulation of a significant amount of any intermediate manganese complex. The ascorbate anion shows overwhelming kinetic dominance over ascorbic acid, but no evidence is available for deprotonation of hydrogen peroxide. The preferred intimate mechanism for hydrogen peroxide is inner sphere but that for ascorbic acid is uncertain. For both reductants, increased extent of aquation leads to increased kinetic activity in the order: 1 < 2 < 3.Key words: kinetics, manganese, ascorbic acid, hydrogen peroxide, 2,2prime-bipyridine.

Kinetics of the oxidation of hydrogen sulfite by hydrogen peroxide in aqueous solution:

1999 ◽  
Vol 33 (27) ◽  
pp. 4413-4419 ◽  
Author(s):  
Frank Maaß ◽  
Horst Elias ◽  
Klaus J. Wannowius
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Peroxide ◽  
Oxidation Of Hydrogen ◽  
Kinetics Of
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