期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 105, 期 14, 页码 3658-3666出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp0038052
关键词
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The one-electron reduction product of nitrate, the NO32- radical, was reinvestigated because of the contemporary interest in its reactivity in high-level liquid radioactive systems, Indirect observations suggest that the same dianion is produced by the precursor to the solvated electron. The redox potential of the couple NO3-/NO32- was calculated, using several ab initio approaches combined with semiempirical solvation models, to be E-o approximate to --1.1 V vs NHE. Using the theoretical prediction to guide the experiment, we find a value of E-o = -0.89 V at zero ionic strength. Kinetic and free-energy-relationship arguments are used to question the acid-base equilibria and reaction mode that converts the NO32- to the oxidizing NO2 radical. It is proposed that the reaction of the dianion with various general acids is an O2- (i.e., water or OH-) transfer to the acid and not proton transfer to NO32-, Implications of the highly negative redox potential of the dianion and the existence of the protonated forms to practical systems are discussed.
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