Abstract

Absorption spectra of the complex [UO 2(NO 3) 2(TBP) 2] in various organic solvent solutions and that of [UO 2(CH 3COO) 3] − in water solutions of various acetates have been determined. The stepwise formation of uranyl acetate complexes has been followed spectrophotometrically. Characteristic features of spectra effects accompanying solvent exchange, outer-sphere association and ligand exchange involving the uranyl ion are discussed. Conclusions are drawn from the spectral effects observed regarding the interpretation of the absorption band of the uranyl ion between 370 and 480 mμ.

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