Properties of Superoxide Ion

The thermodynamie reduction potential for the O2IO2 pair has been determined using redox mediator dyes and spectrophotometry [77, 78]. The reaction is expressed as 02(g, 1 atm) -1- e and its eorresponding standard electrode 

The fomial potential ehange with solvent is due to the salvation energy of O2 in different solvents. The value beeomes more positive with inereasing salvation energy. Thus, the salvation energy of O2 in these aprotie solvents follows the sequenee  

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One of the effects of ligation to metal ions on the properties of superoxide ion is to stabilise it with respect to reduction to oxygen (the reduction potential of O2 is made more positive). 

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