Abstract
Abstract The stability constants and the molar extinction coefficients of uranium(IV) fluoride complexes were determined in aqueous solutions containing 1 M (Na++H+)Cl− as a constant ionic medium at 25 °C. The emf data obtained by the use of a fluoride-ion-selective electrode were explained in terms of the formation of a series of mononuclear complexes, UF3+, UF22+, UF3+, and UF4, with stability constants β1=(2.2±0.13)×107, β2=(1.33±0.05)×1013, β3=(2.9±0.5)×1017, and β4=(6±1)×1021 respectively. Using these values for β’s the spectra observed in the 350–700 nm region were analyzed by means of a computer in order to estimate the molar extinction coefficients of each uranium(IV) fluoride complex species.
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