Thermochemical study determines ionization heats and standard potentials for aqueous HO2 and OH radicals, providing fundamental thermodynamic parameters for reactive oxygen species.
Acid dissociation constants of OH and HO2 were measured over a range of temperature and give heats of ionization of 10 and 0 kcal mol–1 respectively. These values lead to ΔH°f of (O–2)aq and (O–)aq=–8(±2) and 9(±2) kcal mol–1 respectively. Solvation energies of O–2 and O– are estimated to be 94 and 113 kcal mol–1 and the E° of the couples O2/O–2, O/O–, –0.19 and 1.64 V respectively.
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Baxendale et al. (1971) studied this question.
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