Abstract
Potentiometry using nitrate ion-selective electrodes, Raman, 1H n.m.r. and u.v.–visible absorption spectroscopy have been used to study the co-ordination behaviour of dioxouranium(VI) nitrate in water–acetone mixtures over the complete solvent composition range. At the concentrations studied (up to 0.14 mol dm–3) there was no evidence of UO22+–NO3– complexing in pure water, and the co-ordination species is believed to be [UO2(H2O)5]2+. Complexing starts to occur above 60%(v/v) acetone–water, probably via a two-step equilibrium, and at high acetone concentrations the only significant complex species present is suggested to be [UO2(NO3)2(H2O)2].
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