The rate of oxidation of [Fe(CN)6]4– to [Fe(CN)6]3– by O2 in aqueous–organic solvent mixtures depends drastically on the electron-donating abilites of the solvents, the reaction in dimethyl sulphoxide and dimethylformamide being about 104 times faster than in water; the rate does not correlate with the solvent's dielectric constant.
S. Ašperger, I. Murati, D. Pavlović and A. Šustra, J. Chem. Soc., Chem. Commun., 1986, 814 DOI: 10.1039/C39860000814
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