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The exchange of oxygen between uranyl ion and water was studied using oxygen 18 as a tracer. The results showed that the formula of uranyl ion in dilute hydrochloric acid solution is UO2++, neglecting any anion complexing, as distinguished from U(OH)4++, unless in U(OH)4++ two of the oxygen atoms are much more weakly bonded than the other two. The UO2++ ion is covalently bonded in dilute hydrochloric acid solution as well as in crystalline uranyl chloride. The Raman spectrum of uranyl perchlorate was measured and the available Raman spectra of uranyl salts are interpreted considering the effects of complex ion formation.
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H.W. Crandall (1949) studied this question.
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